Deck 9: The Normal Distribution

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Question
Which of the following distributions is not continuous?

A) normal distribution
B) uniform distribution
C) exponential distribution
D) binomial distribution
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Question
Which of the following is always true for a normal distribution?

A) P(x>8)=P(x9)P(x>8)=P(x \geq 9)
B) P(2x8)=P(2x<8)P(2x \leq 8)=P(2 \leq x<8)
C) P(x<5)P(x5)P(x<5) \neq P(x \leq 5)
D) P(x8)=P(x8.5)P(x \leq 8)=P(x \leq 8.5)
Question
If we are using the normal approximation to determine the probability of at most 28 successes in a binomial distribution (P(x28))(P(x \leq 28)) , the normal distribution probability that is used to make the estimate is

A) P(x27.5)P(x \leq 27.5) .
B) P(x28)P(x \leq 28) .
C) P(x28.5)P(x \leq 28.5) .
D) P(x<28)P(x<28) .
Question
When considering area under the standard normal curve, decide whether the area to the right of z=2z=2 is bigger than, smaller than, or equal to the area to the right of z=2.5\mathrm{z}=2.5 .

A) bigger than
B) smaller than
C) equal to
Question
When considering area under the standard normal curve, decide whether the area to the left of z=2.5z=-2.5 is bigger than, smaller than, or equal to the area to the right of z=2.5\mathrm{z}=2.5 .

A) equal to
B) bigger than
C) smaller than
Question
When considering area under the standard normal curve, decide whether the area to the left of z=2.5z=-2.5 is bigger than, smaller than, or equal to the area to the right of z=2z=2 .

A) smaller than
B) bigger than
C) equal to
Question
When considering area under the standard normal curve, decide whether the area to the left of z=0z=0 is bigger than, smaller than, or equal to the area to the right of z=0.2\mathrm{z}=-0.2 .

A) smaller than
B) bigger than
C) equal to
Question
When considering area under the standard normal curve, decide whether the area to the left of z=2.5z=2.5 is bigger than, smaller than, or equal to the area to the right of z=2.5\mathrm{z}=2.5 .

A) bigger than
B) smaller than
C) equal to
Question
When considering area under the standard normal curve, decide whether the area between z=1.5z=-1.5 and z=1z=-1 is bigger than, smaller than, or equal to the area between z=2\mathrm{z}=2 and z=2.5\mathrm{z}=2.5 .

A) bigger than
B) smaller than
C) equal to
Question
When considering area under the standard normal curve, decide whether the area between z=1.5z=-1.5 and z=1.1z=1.1 is bigger than, smaller than, or equal to the area between z=1.1\mathrm{z}=-1.1 and z=1.5\mathrm{z}=1.5 .

A) equal to
B) bigger than
C) smaller than
Question
When considering area under the standard normal curve, decide whether the area between z=0.2z=-0.2 and z=0.2z=0.2 is bigger than, smaller than, or equal to the area between z=0.3\mathrm{z}=-0.3 and z=0.3\mathrm{z}=0.3 .

A) smaller than
B) bigger than
C) equal to
Question
For the uniform distribution pictured below, the probability P(2x2.5)P(2 \leq x \leq 2.5) equals  <strong>For the uniform distribution pictured below, the probability  P(2 \leq x \leq 2.5)  equals  </strong> A)  1 / 6 . B) 1 . C) 1.3 . D) none of these <div style=padding-top: 35px>

A) 1/61 / 6 .
B) 1 .
C) 1.3 .
D) none of these
Question
For the uniform distribution pictured below, the probability P(x=2)P(x=2) equals  <strong>For the uniform distribution pictured below, the probability  P(x=2)  equals  </strong> A) 0 . B)  1 / 3 . C)  2 / 3 . D) none of these <div style=padding-top: 35px>

A) 0 .
B) 1/31 / 3 .
C) 2/32 / 3 .
D) none of these
Question
For the uniform distribution pictured below, the probability P(x2.5)P(x \leq 2.5) equals  <strong>For the uniform distribution pictured below, the probability  P(x \leq 2.5)  equals  </strong> A)  5 / 6 . B) 1 . C)  1 / 3 . D) none of these <div style=padding-top: 35px>

A) 5/65 / 6 .
B) 1 .
C) 1/31 / 3 .
D) none of these
Question
The area to the right of z=1.0z=1.0 is equal to

A) 0.3413 .
B) 0.8413 .
C) 0.6816 .
D) 0.1587 .
Question
To determine the probability of obtaining exactly 20 successes in 50 trials with p=0.30p=0.30 , we should use

A) the binomial formula.
B) the Poisson formula.
C) the normal approximation to the binomial distribution.
D) the normal table.
Question
The probability of obtaining exactly 20 successes in 50 trials

A) is equal to 0 .
B) can be approximated by using the normal table with xx between 19.5 and 20.5.
C) can only be approximated by the binomial formula.
D) cannot be found using the normal table.
Question
The problem that is solved by using the standard formula table and the formula μ=np\mu=n p

A) involves Table V.
B) involves the normal approximation to the binomial distribution.
C) originally involved the normal approximation.
D) originally involved the Poisson distribution.
Question
In a binomial distribution with 10 trials, which of the following is true?

A)  <strong>In a binomial distribution with 10 trials, which of the following is true?</strong> A)   B)  P(x<4)=P(x \geq 5)-P(x \geq 4)  C)  P(x<6)=1-P(x \geq 7)  D)  P(x>7)=P(x \geq 8)  <div style=padding-top: 35px>
B) P(x<4)=P(x5)P(x4)P(x<4)=P(x \geq 5)-P(x \geq 4)
C) P(x<6)=1P(x7)P(x<6)=1-P(x \geq 7)
D) P(x>7)=P(x8)P(x>7)=P(x \geq 8)
Question
If xx is a normal random variable with μ=50\mu=50 and σ=6\sigma=6 , then the probability that xx is not between 44 and 56 is

A) 0.6826 .
B) 0.3413 .
C) 0.8413 .
D) 0.3174 .
Question
The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.
The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.   -Between -1 and 1<div style=padding-top: 35px>
-Between -1 and 1
Question
The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.
 The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.   -Between  1 / 2  and  3 / 2 <div style=padding-top: 35px>
-Between 1/21 / 2 and 3/23 / 2
Question
The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.
The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.   -Between -2 and -1<div style=padding-top: 35px>
-Between -2 and -1
Question
Find the standard normal-curve area indicated using the normal table.
-Between z=1.3\mathrm{z}=-1.3 and z=0.4\mathrm{z}=-0.4
Question
Find the standard normal-curve area indicated using the normal table.
-To the left of z=0.67z=0.67
Question
Find the standard normal-curve area indicated using the normal table.
-To the left of z=0.54z=-0.54
Question
If a random variable has the normal distribution with μ=30\mu=30 and σ=5\sigma=5 , find the probability that it will take on the indicated value.
-Less than 32
Question
If a random variable has the normal distribution with μ=30\mu=30 and σ=5\sigma=5 , find the probability that it will take on the indicated value.
-Between 31 and 35
Question
If a random variable has the normal distribution with μ=30\mu=30 and σ=5\sigma=5 , find the probability that it will take on the indicated value.
-Between 24 and 28
Question
Find the following zz values.

-z0.05
Question
Find the following zz values.

-z0.45
Question
Find the following zz values.

-z0.65
Question
Find the following zz values.

-z0.90
Question
Find zz if the normal curve area to the right of zz is 0.8997 .
Question
Find zz if the normal curve area to the left of zz is 0.1611 .
Question
A normal distribution has mean μ=60\mu=60 . If 15.87%15.87 \% of the area under the curve is to the left of 54 , find the area to the right of 64.
Question
A normal distribution has mean μ=60\mu=60 . If 15.87%15.87 \% of the area under the curve is to the left of 54 , find the area between 58 and 63 .
Question
The number of ounces of soda that a vending machine dispenses per cup is normally distributed with a mean of 12 ounces and a standard deviation of 4 ounces.
-Find the probability that more than 16 ounces is dispensed in a cup.
Question
The number of ounces of soda that a vending machine dispenses per cup is normally distributed with a mean of 12 ounces and a standard deviation of 4 ounces.
-Find the probability that between 15 and 18 ounces are dispensed in a cup.
Question
The number of ounces of soda that a vending machine dispenses per cup is normally distributed with a mean of 12 ounces and a standard deviation of 4 ounces.
-Find the number of ounces above which 80%80 \% of the dispensed sodas will fall. Round to the nearest tenth.
Question
An electronics firm believes that 70%70 \% of the new products they market will be successful. If the company markets 80 products in the next 5 years, find the probability that in that time
-at least 60 products will be successful.
Question
An electronics firm believes that 70%70 \% of the new products they market will be successful. If the company markets 80 products in the next 5 years, find the probability that in that time
-at most 50 products will be successful.
Question
An electronics firm believes that 70%70 \% of the new products they market will be successful. If the company markets 80 products in the next 5 years, find the probability that in that time
-between 55 and 59 products, inclusive, will be successful.
Question
A supermarket manager has determined that the amount of time customers spend in the supermarket is approximately normally distributed with a mean of 45 minutes and a standard deviation of 6 minutes.
-Find the probability that a customer spends less than 48 minutes in the supermarket.
Question
A supermarket manager has determined that the amount of time customers spend in the supermarket is approximately normally distributed with a mean of 45 minutes and a standard deviation of 6 minutes.
-Find the probability that a customer spends between 39 and 43 minutes in the supermarket.
Question
A supermarket manager has determined that the amount of time customers spend in the supermarket is approximately normally distributed with a mean of 45 minutes and a standard deviation of 6 minutes.

-Find the number of minutes, mm , for which the probability that a customer spends less than minutes in the supermarket is 0.10 . Round your answer to the nearest tenth.
Question
It has been estimated that 40%40 \% of the televisions that a manufacturer makes need repairs in the first three years of operation. A new hotel buys 90 televisions from this company. Find the probability that in the first three years of operation
-less than 32 of the televisions need repairs.
Question
It has been estimated that 40%40 \% of the televisions that a manufacturer makes need repairs in the first three years of operation. A new hotel buys 90 televisions from this company. Find the probability that in the first three years of operation
-between 38 and 42 of the televisions, inclusive, need repairs.
Question
The waiting time in a doctor's office has an exponential distribution with μ=45\mu=45 minutes. Find the probability that
-a patient has to wait between 0 and 30 minutes.
Question
The waiting time in a doctor's office has an exponential distribution with μ=45\mu=45 minutes. Find the probability that
-a patient has to wait between 35 and 50 minutes.
Question
Find the indicated normal-curve area using the normal table.
-Between z=1.48z=-1.48 and z=0z=0
Question
Find the indicated normal-curve area using the normal table.
-Between z=1.23\mathrm{z}=-1.23 and z=0.56\mathrm{z}=0.56
Question
Find the indicated normal-curve area using the normal table.
-Between z=1.23\mathrm{z}=-1.23 and z=1.23\mathrm{z}=1.23
Question
Find the indicated normal-curve area using the normal table.
-Between z=1.23\mathrm{z}=1.23 and z=2.34\mathrm{z}=2.34
Question
Find the indicated normal-curve area using the normal table.
-To the left of z=1.5z=-1.5 .
Question
Find the indicated normal-curve area using the normal table.
-Between z=1.3z=-1.3 and z=1z=1 .
Question
Find the indicated normal-curve area using the normal table.
-Between z=2z=-2 and z=1z=-1 .
Question
Find zz if the normal curve area to the left of zz is 0.3015.
Question
Find zz if the normal curve area between 0 and zz is 0.4345 .
Question
Find zz if the normal curve area between z-z and zz is 0.9512 .
Question
Find zz if the normal curve area to the left of zz is 0.8962 .
Question
Find zz if the normal curve area to the right of zz is 0.3483 .
Question
Find zz if the normal curve area to the right of zz is 0.8665 .
Question
A salesperson knows that 20%20 \% of her presentations result in sales. Find the probabilities that in the next 60 presentations}
-at least 9 result in sales.
Question
A salesperson knows that 20%20 \% of her presentations result in sales. Find the probabilities that in the next 60 presentations}
-between 14 and 18, inclusive, result in sales.
Question
A machine pours beer into 16oz16 \mathrm{oz} . bottles. Experience has shown that the number of ounces poured is normally distributed with a standard deviation of 1.5 ounces. Find the probabilities that the amount of beer the machine will pour into the next bottle will be
-more than 17 ounces.
Question
A machine pours beer into 16oz16 \mathrm{oz} . bottles. Experience has shown that the number of ounces poured is normally distributed with a standard deviation of 1.5 ounces. Find the probabilities that the amount of beer the machine will pour into the next bottle will be
-between 12 and 14 ounces.
Question
The annual number of earthquakes in a certain region is a random variable having approximately a normal distribution with μ=15.7\mu=15.7 . What is the standard deviation of this distribution if the probability is 0.70 that there will be at least 14 earthquakes? Round answer to the nearest tenth.
Question
The probability is 0.26 that a cloud seeded with silver iodide will fail to show spectacular growth. Use the normal approximation to the binomial distribution to find the probability that among 50 clouds seeded with silver iodide only 13 will fail to show spectacular growth. Round answer to the nearest hundredth.
Question
The equation f(x)=0.125f(x)=0.125 can serve as the probability density function of a random variable that takes on values on the interval from 1 to 8 .
Question
The equation f(x)=16(2x3)f(x)=\frac{1}{6}(2 x-3) can serve as a probability density of a random variable that takes on values on the interval from 1 to 3.
Question
The continuity correction is always used in the problems involving the normal distribution.
Question
The normal approximation to the binomial distribution applies in problems that originally involve the normal distribution.
Question
The zz value such that the area to the left of zz is 0.05 is located to the left of zero on the zz -axis.
Question
    then   x  must be a discrete random variable.<div style=padding-top: 35px>  then x x must be a discrete random variable.
Question
If the area in the standard normal distribution is on the left side of zero, then that area has a negative value.
Question
It is never desirable to use the normal approximation to the binomial distribution to solve binomial problems that can be solved by using Table V.
Question
The formula μ=np\mu=n p is used to convert any normally distributed variable to one which has a mean of 0 and a standard deviation of 1.
Question
The formula σ=np(1p)\sigma=\sqrt{n p(1-p)} finds the standard deviation in problems which originally involve the binomial distribution.
Question
The mean of every normal distribution is equal to 0.
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Deck 9: The Normal Distribution
1
Which of the following distributions is not continuous?

A) normal distribution
B) uniform distribution
C) exponential distribution
D) binomial distribution
binomial distribution
2
Which of the following is always true for a normal distribution?

A) P(x>8)=P(x9)P(x>8)=P(x \geq 9)
B) P(2x8)=P(2x<8)P(2x \leq 8)=P(2 \leq x<8)
C) P(x<5)P(x5)P(x<5) \neq P(x \leq 5)
D) P(x8)=P(x8.5)P(x \leq 8)=P(x \leq 8.5)
P(2x8)=P(2x<8)P(2x \leq 8)=P(2 \leq x<8)
3
If we are using the normal approximation to determine the probability of at most 28 successes in a binomial distribution (P(x28))(P(x \leq 28)) , the normal distribution probability that is used to make the estimate is

A) P(x27.5)P(x \leq 27.5) .
B) P(x28)P(x \leq 28) .
C) P(x28.5)P(x \leq 28.5) .
D) P(x<28)P(x<28) .
P(x28.5)P(x \leq 28.5) .
4
When considering area under the standard normal curve, decide whether the area to the right of z=2z=2 is bigger than, smaller than, or equal to the area to the right of z=2.5\mathrm{z}=2.5 .

A) bigger than
B) smaller than
C) equal to
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5
When considering area under the standard normal curve, decide whether the area to the left of z=2.5z=-2.5 is bigger than, smaller than, or equal to the area to the right of z=2.5\mathrm{z}=2.5 .

A) equal to
B) bigger than
C) smaller than
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6
When considering area under the standard normal curve, decide whether the area to the left of z=2.5z=-2.5 is bigger than, smaller than, or equal to the area to the right of z=2z=2 .

A) smaller than
B) bigger than
C) equal to
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7
When considering area under the standard normal curve, decide whether the area to the left of z=0z=0 is bigger than, smaller than, or equal to the area to the right of z=0.2\mathrm{z}=-0.2 .

A) smaller than
B) bigger than
C) equal to
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8
When considering area under the standard normal curve, decide whether the area to the left of z=2.5z=2.5 is bigger than, smaller than, or equal to the area to the right of z=2.5\mathrm{z}=2.5 .

A) bigger than
B) smaller than
C) equal to
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9
When considering area under the standard normal curve, decide whether the area between z=1.5z=-1.5 and z=1z=-1 is bigger than, smaller than, or equal to the area between z=2\mathrm{z}=2 and z=2.5\mathrm{z}=2.5 .

A) bigger than
B) smaller than
C) equal to
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10
When considering area under the standard normal curve, decide whether the area between z=1.5z=-1.5 and z=1.1z=1.1 is bigger than, smaller than, or equal to the area between z=1.1\mathrm{z}=-1.1 and z=1.5\mathrm{z}=1.5 .

A) equal to
B) bigger than
C) smaller than
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11
When considering area under the standard normal curve, decide whether the area between z=0.2z=-0.2 and z=0.2z=0.2 is bigger than, smaller than, or equal to the area between z=0.3\mathrm{z}=-0.3 and z=0.3\mathrm{z}=0.3 .

A) smaller than
B) bigger than
C) equal to
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12
For the uniform distribution pictured below, the probability P(2x2.5)P(2 \leq x \leq 2.5) equals  <strong>For the uniform distribution pictured below, the probability  P(2 \leq x \leq 2.5)  equals  </strong> A)  1 / 6 . B) 1 . C) 1.3 . D) none of these

A) 1/61 / 6 .
B) 1 .
C) 1.3 .
D) none of these
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13
For the uniform distribution pictured below, the probability P(x=2)P(x=2) equals  <strong>For the uniform distribution pictured below, the probability  P(x=2)  equals  </strong> A) 0 . B)  1 / 3 . C)  2 / 3 . D) none of these

A) 0 .
B) 1/31 / 3 .
C) 2/32 / 3 .
D) none of these
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14
For the uniform distribution pictured below, the probability P(x2.5)P(x \leq 2.5) equals  <strong>For the uniform distribution pictured below, the probability  P(x \leq 2.5)  equals  </strong> A)  5 / 6 . B) 1 . C)  1 / 3 . D) none of these

A) 5/65 / 6 .
B) 1 .
C) 1/31 / 3 .
D) none of these
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15
The area to the right of z=1.0z=1.0 is equal to

A) 0.3413 .
B) 0.8413 .
C) 0.6816 .
D) 0.1587 .
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16
To determine the probability of obtaining exactly 20 successes in 50 trials with p=0.30p=0.30 , we should use

A) the binomial formula.
B) the Poisson formula.
C) the normal approximation to the binomial distribution.
D) the normal table.
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17
The probability of obtaining exactly 20 successes in 50 trials

A) is equal to 0 .
B) can be approximated by using the normal table with xx between 19.5 and 20.5.
C) can only be approximated by the binomial formula.
D) cannot be found using the normal table.
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18
The problem that is solved by using the standard formula table and the formula μ=np\mu=n p

A) involves Table V.
B) involves the normal approximation to the binomial distribution.
C) originally involved the normal approximation.
D) originally involved the Poisson distribution.
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19
In a binomial distribution with 10 trials, which of the following is true?

A)  <strong>In a binomial distribution with 10 trials, which of the following is true?</strong> A)   B)  P(x<4)=P(x \geq 5)-P(x \geq 4)  C)  P(x<6)=1-P(x \geq 7)  D)  P(x>7)=P(x \geq 8)
B) P(x<4)=P(x5)P(x4)P(x<4)=P(x \geq 5)-P(x \geq 4)
C) P(x<6)=1P(x7)P(x<6)=1-P(x \geq 7)
D) P(x>7)=P(x8)P(x>7)=P(x \geq 8)
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20
If xx is a normal random variable with μ=50\mu=50 and σ=6\sigma=6 , then the probability that xx is not between 44 and 56 is

A) 0.6826 .
B) 0.3413 .
C) 0.8413 .
D) 0.3174 .
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21
The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.
The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.   -Between -1 and 1
-Between -1 and 1
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22
The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.
 The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.   -Between  1 / 2  and  3 / 2
-Between 1/21 / 2 and 3/23 / 2
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23
The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.
The graph shows the distribution of a continuous random variable that takes on values on the continuous interval from -2 to 2 . Find the probability that this random variable will take on the value indicated.   -Between -2 and -1
-Between -2 and -1
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24
Find the standard normal-curve area indicated using the normal table.
-Between z=1.3\mathrm{z}=-1.3 and z=0.4\mathrm{z}=-0.4
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25
Find the standard normal-curve area indicated using the normal table.
-To the left of z=0.67z=0.67
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26
Find the standard normal-curve area indicated using the normal table.
-To the left of z=0.54z=-0.54
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27
If a random variable has the normal distribution with μ=30\mu=30 and σ=5\sigma=5 , find the probability that it will take on the indicated value.
-Less than 32
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28
If a random variable has the normal distribution with μ=30\mu=30 and σ=5\sigma=5 , find the probability that it will take on the indicated value.
-Between 31 and 35
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29
If a random variable has the normal distribution with μ=30\mu=30 and σ=5\sigma=5 , find the probability that it will take on the indicated value.
-Between 24 and 28
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30
Find the following zz values.

-z0.05
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31
Find the following zz values.

-z0.45
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32
Find the following zz values.

-z0.65
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33
Find the following zz values.

-z0.90
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34
Find zz if the normal curve area to the right of zz is 0.8997 .
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35
Find zz if the normal curve area to the left of zz is 0.1611 .
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36
A normal distribution has mean μ=60\mu=60 . If 15.87%15.87 \% of the area under the curve is to the left of 54 , find the area to the right of 64.
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37
A normal distribution has mean μ=60\mu=60 . If 15.87%15.87 \% of the area under the curve is to the left of 54 , find the area between 58 and 63 .
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38
The number of ounces of soda that a vending machine dispenses per cup is normally distributed with a mean of 12 ounces and a standard deviation of 4 ounces.
-Find the probability that more than 16 ounces is dispensed in a cup.
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39
The number of ounces of soda that a vending machine dispenses per cup is normally distributed with a mean of 12 ounces and a standard deviation of 4 ounces.
-Find the probability that between 15 and 18 ounces are dispensed in a cup.
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40
The number of ounces of soda that a vending machine dispenses per cup is normally distributed with a mean of 12 ounces and a standard deviation of 4 ounces.
-Find the number of ounces above which 80%80 \% of the dispensed sodas will fall. Round to the nearest tenth.
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41
An electronics firm believes that 70%70 \% of the new products they market will be successful. If the company markets 80 products in the next 5 years, find the probability that in that time
-at least 60 products will be successful.
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42
An electronics firm believes that 70%70 \% of the new products they market will be successful. If the company markets 80 products in the next 5 years, find the probability that in that time
-at most 50 products will be successful.
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43
An electronics firm believes that 70%70 \% of the new products they market will be successful. If the company markets 80 products in the next 5 years, find the probability that in that time
-between 55 and 59 products, inclusive, will be successful.
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44
A supermarket manager has determined that the amount of time customers spend in the supermarket is approximately normally distributed with a mean of 45 minutes and a standard deviation of 6 minutes.
-Find the probability that a customer spends less than 48 minutes in the supermarket.
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45
A supermarket manager has determined that the amount of time customers spend in the supermarket is approximately normally distributed with a mean of 45 minutes and a standard deviation of 6 minutes.
-Find the probability that a customer spends between 39 and 43 minutes in the supermarket.
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46
A supermarket manager has determined that the amount of time customers spend in the supermarket is approximately normally distributed with a mean of 45 minutes and a standard deviation of 6 minutes.

-Find the number of minutes, mm , for which the probability that a customer spends less than minutes in the supermarket is 0.10 . Round your answer to the nearest tenth.
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47
It has been estimated that 40%40 \% of the televisions that a manufacturer makes need repairs in the first three years of operation. A new hotel buys 90 televisions from this company. Find the probability that in the first three years of operation
-less than 32 of the televisions need repairs.
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48
It has been estimated that 40%40 \% of the televisions that a manufacturer makes need repairs in the first three years of operation. A new hotel buys 90 televisions from this company. Find the probability that in the first three years of operation
-between 38 and 42 of the televisions, inclusive, need repairs.
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49
The waiting time in a doctor's office has an exponential distribution with μ=45\mu=45 minutes. Find the probability that
-a patient has to wait between 0 and 30 minutes.
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50
The waiting time in a doctor's office has an exponential distribution with μ=45\mu=45 minutes. Find the probability that
-a patient has to wait between 35 and 50 minutes.
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51
Find the indicated normal-curve area using the normal table.
-Between z=1.48z=-1.48 and z=0z=0
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52
Find the indicated normal-curve area using the normal table.
-Between z=1.23\mathrm{z}=-1.23 and z=0.56\mathrm{z}=0.56
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53
Find the indicated normal-curve area using the normal table.
-Between z=1.23\mathrm{z}=-1.23 and z=1.23\mathrm{z}=1.23
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54
Find the indicated normal-curve area using the normal table.
-Between z=1.23\mathrm{z}=1.23 and z=2.34\mathrm{z}=2.34
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55
Find the indicated normal-curve area using the normal table.
-To the left of z=1.5z=-1.5 .
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56
Find the indicated normal-curve area using the normal table.
-Between z=1.3z=-1.3 and z=1z=1 .
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57
Find the indicated normal-curve area using the normal table.
-Between z=2z=-2 and z=1z=-1 .
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58
Find zz if the normal curve area to the left of zz is 0.3015.
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59
Find zz if the normal curve area between 0 and zz is 0.4345 .
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60
Find zz if the normal curve area between z-z and zz is 0.9512 .
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61
Find zz if the normal curve area to the left of zz is 0.8962 .
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62
Find zz if the normal curve area to the right of zz is 0.3483 .
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63
Find zz if the normal curve area to the right of zz is 0.8665 .
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64
A salesperson knows that 20%20 \% of her presentations result in sales. Find the probabilities that in the next 60 presentations}
-at least 9 result in sales.
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65
A salesperson knows that 20%20 \% of her presentations result in sales. Find the probabilities that in the next 60 presentations}
-between 14 and 18, inclusive, result in sales.
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66
A machine pours beer into 16oz16 \mathrm{oz} . bottles. Experience has shown that the number of ounces poured is normally distributed with a standard deviation of 1.5 ounces. Find the probabilities that the amount of beer the machine will pour into the next bottle will be
-more than 17 ounces.
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67
A machine pours beer into 16oz16 \mathrm{oz} . bottles. Experience has shown that the number of ounces poured is normally distributed with a standard deviation of 1.5 ounces. Find the probabilities that the amount of beer the machine will pour into the next bottle will be
-between 12 and 14 ounces.
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68
The annual number of earthquakes in a certain region is a random variable having approximately a normal distribution with μ=15.7\mu=15.7 . What is the standard deviation of this distribution if the probability is 0.70 that there will be at least 14 earthquakes? Round answer to the nearest tenth.
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69
The probability is 0.26 that a cloud seeded with silver iodide will fail to show spectacular growth. Use the normal approximation to the binomial distribution to find the probability that among 50 clouds seeded with silver iodide only 13 will fail to show spectacular growth. Round answer to the nearest hundredth.
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70
The equation f(x)=0.125f(x)=0.125 can serve as the probability density function of a random variable that takes on values on the interval from 1 to 8 .
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71
The equation f(x)=16(2x3)f(x)=\frac{1}{6}(2 x-3) can serve as a probability density of a random variable that takes on values on the interval from 1 to 3.
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72
The continuity correction is always used in the problems involving the normal distribution.
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73
The normal approximation to the binomial distribution applies in problems that originally involve the normal distribution.
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74
The zz value such that the area to the left of zz is 0.05 is located to the left of zero on the zz -axis.
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75
    then   x  must be a discrete random variable. then x x must be a discrete random variable.
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76
If the area in the standard normal distribution is on the left side of zero, then that area has a negative value.
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77
It is never desirable to use the normal approximation to the binomial distribution to solve binomial problems that can be solved by using Table V.
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78
The formula μ=np\mu=n p is used to convert any normally distributed variable to one which has a mean of 0 and a standard deviation of 1.
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79
The formula σ=np(1p)\sigma=\sqrt{n p(1-p)} finds the standard deviation in problems which originally involve the binomial distribution.
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80
The mean of every normal distribution is equal to 0.
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