Question 1

TABLE 6-5
Suppose the time interval between two consecutive defective light bulbs from a production line has a uniform distribution over an interval from 0 to 90 minutes.
-Referring to Table 6-5, the probability is 90% that the time interval between two consecutive defective light bulbs will fall between which two values that are the same distance from the mean?

Accepted Answer

The answer of TABLE 6-5
Suppose the time interval between two...

Question 2

The amount of pyridoxine (in grams) in a multiple vitamin is normally distributed with µ = 110 grams and a = 25 grams. What is the probability that a randomly selected vitamin will contain less than 100 grams or more than 120 grams of pyridoxine?

Accepted Answer

The answer of The amount of pyridoxine (in grams) in...

Question 3

TABLE 6-3
The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper is normally distributed with population mean 320 and population standard deviation 20 inches.
-Referring to Table 6-3, for a randomly chosen Monday, what is the probability there will be between 280 and 360 column inches of classified advertisement?

Accepted Answer

The answer of TABLE 6-3
The number of column inches of...

Question 4

You were told that the amount of time lapsed between consecutive trades on the New York Stock Exchange followed a normal distribution with a mean of 15 seconds. You were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. The probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. What is the probability that the time lapsed between two consecutive trades will be between 15 and 16 seconds?

Accepted Answer

The answer of You were told that the amount of...

Question 5

You were told that the mean score on a statistics exam is 75 with the scores normally distributed. In addition, you know the probability of a score between 55 and 60 is 4.41% and that the probability of a score greater than 90 is 6.68%. What is the probability of a score greater than 95?

Accepted Answer

The answer of You were told that the mean score...

Question 6

Patients arriving at an outpatient clinic follow an exponential distribution at a rate of 1.5 patients per hour. What is the probability that a randomly chosen arrival to be between 10 and 15 minutes?

Accepted Answer

The answer of Patients arriving at an outpatient clinic follow...

Question 7

TABLE 6-6
The interval between consecutive hits at a web site is assumed to follow an exponential distribution with an average of 40 hits per minute.
-Referring to Table 6-6, what is the probability that the next hit at the web site will occur between the next 1.2 and 1.5 seconds after just being hit by a visitor?

Accepted Answer

The answer of TABLE 6-6
The interval between consecutive hits at...

Question 8

Times spent watching TV every week by first graders follow an exponential distribution with mean 10 hours. The probability that a given first grader spends more than 5 hours watching TV is _____.

Accepted Answer

The answer of Times spent watching TV every week by...

Question 9

Suppose Z has a standard normal distribution with a mean of 0 and standard deviation of
The probability that Z is more than 0.77 is _____ .

Accepted Answer

The answer of Suppose Z has a standard normal distribution...

Question 10

Times spent watching TV every week by first graders follow an exponential distribution with mean 10 hours. The probability that a given first grader spends between 10 and 15 hours watching TV is______ .

Accepted Answer

The answer of Times spent watching TV every week by...

Question 11

Patients arriving at an outpatient clinic follow an exponential distribution with mean 15 minutes. What is the average number of arrivals per minute?

Accepted Answer

The answer of Patients arriving at an outpatient clinic follow...

Question 12

TABLE 6-3
The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper is normally distributed with population mean 320 and population standard deviation 20 inches.
-Referring to Table 6-3, for a randomly chosen Monday the probability is 0.1 that there will be less than how many column inches of classified advertisements?

Accepted Answer

The answer of TABLE 6-3
The number of column inches of...

Question 13

TABLE 6-5
Suppose the time interval between two consecutive defective light bulbs from a production line has a uniform distribution over an interval from 0 to 90 minutes.
-Referring to Table 6-5, what is the mean of the time interval?

Accepted Answer

The answer of TABLE 6-5
Suppose the time interval between two...

Question 14

TABLE 6-1
The manager of a surveying company believes that the average number of phone surveys completed per hour by her employees has a normal distribution. She takes a sample of 15 days output from her employees and determines the average number of surveys per hour on these days. The ordered array for this data is: 10.0, 10.1, 10.3, 10.5, 10.7, 11.2, 11.4, 11.5, 11.7,
11.8, 11.8, 12.0, 12.2, 12.2, 12.5.
-Referring to Table 6-1, the fourteenth standard normal quantile is_____ .

Accepted Answer

The answer of TABLE 6-1
The manager of a surveying company...

Question 15

The owner of a fish market determined that the average weight for a catfish is 3.2 pounds with a standard deviation of 0.8 pound. Assuming the weights of catfish are normally distributed, above what weight (in pounds) do 89.80% of the weights occur?

Accepted Answer

The answer of The owner of a fish market determined...

Question 16

You were told that the mean score on a statistics exam is 75 with the scores normally distributed. In addition, you know the probability of a score between 55 and 60 is 4.41% and that the probability of a score greater than 90 is 6.68%. What is the probability of a score between 60 and 75?

Accepted Answer

The answer of You were told that the mean score...

Question 17

A food processor packages orange juice in small jars. The weights of the filled jars are approximately normally distributed with a mean of 10.5 ounces and a standard deviation of 0.3 ounce. Find the proportion of all jars packaged by this process that have weights that fall above 10.95 ounces.

Accepted Answer

The answer of A food processor packages orange juice in...

Question 18

TABLE 6-6
The interval between consecutive hits at a web site is assumed to follow an exponential distribution with an average of 40 hits per minute.
-Referring to Table 6-6, what is the probability that the next hit at the web site will occur within no sooner than 5 seconds after just being hit by a visitor?

Accepted Answer

The answer of TABLE 6-6
The interval between consecutive hits at...

Question 19

TABLE 6-2
The city manager of a large city believes that the number of reported accidents on any weekend has a normal distribution. She takes a sample of nine weekends and determines the number of reported accidents during each. The ordered array for this data is: 15, 46, 53, 54, 55, 76, 82, 256, 407.
-Referring to Table 6-2, the sixth standard normal quantile is______ .

Accepted Answer

The answer of TABLE 6-2
The city manager of a large...

Question 20

Suppose Z has a standard normal distribution with a mean of 0 and standard deviation of
The probability that Z is between -2.89 and -1.03 is _____.

Accepted Answer