Deck 21: Percent of Error and Averages

Question 1

On one tank of gasoline, a car gets 25.3 mpg. The next day it gets 23.4 mpg, and the following day 22.7 mpg. What is the average for the three days?

A) 20.5
B) 22.0
C) 23.8
D) 24.7

Answer 1

23.8

Question 2

The amount of error allowed in the size of structural steel is 1/10 of 1%. If an I beam is 7.2 inches deep, what, in inches, is the amount of error allowed?

A) 0.0072
B) 0.072
C) 0.72
D) 7.2

Answer 2

0.0072

Question 3

The speedometer of a car shows 37 mph. The actual speed is 43 mph. What is the percent of error to the nearest tenth?

A) 13.3
B) 13.4
C) 13.7
D) 14.0

Answer 3

14.0

Question 4

On a trip the miles traveled are: Monday, 234 miles; Tuesday, 237 miles; Wednesday, 834 miles; Thursday, 398 miles. What is the average number of miles traveled per day?

A) 405.75
B) 415.50
C) 425.75
D) 525.75

Question 5

Six batteries are tested with the following readings: 12.73 volts, 12.23 volts, 12.9 volts, 12.48 volts, 12.29 volts, and 12.16 volts. What is the average reading?

A) 12.455
B) 12.465
C) 12.475
D) 12.480

Question 6

____________________ is the difference between what something does and what it should do.

Question 7

A thermometer registered 85 degrees F, but the actual temperature was 90 degrees F. The percent error to the nearest tenth is ____________________%

Question 8

Three mechanics in a shop receive $10.55 per hour, $9.15 per hour, and $10.70 per hour. What is the average hourly pay? Round to the nearest cent.

A) $9.32
B) $10.13
C) $11.84
D) $12.33

Question 9

____________________ are found by adding the sum of the units and then dividing by the number of units.

Question 10

On a test, the marks for ten students are: 2 students, 95%; 4 students, 88%; 3 students, 70%; and 1 student, 81%. What is the average mark on the test?

A) 80.3
B) 81.9
C) 82.1
D) 83.3