Unformatted text preview: or a license plate renewal at a local office of a state motor
vehicle department has been found to be normally distributed with a mean of 30 minutes and
a standard deviation of 8 minutes. What is the probability that a randomly selected individual
will have a waiting time at least 10 minutes?
A. .9938
B. .8944
C. .1056
D. .0062 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 1520 Chapter 01  An Introduction to Business Statistics 120. Suppose that the waiting time for a license plate renewal at a local office of a state motor
vehicle department has been found to be normally distributed with a mean of 30 minutes and
a standard deviation of 8 minutes. What is the probability that a randomly selected individual
will have a waiting time no more than 22 minutes?
A. .1587
B. .9977
C. .8413
D. .0023 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Normal Distribution 121. Suppose that the waiting time for a license plate renewal at a local office of a state motor
vehicle department has been found to be normally distributed with a mean of 30 minutes and
a standard deviation of 8 minutes. Suppose that in an effort to provide better service to the
public, the director of the local office is permitted to provide discounts to those individuals
whose waiting time exceeds a predetermined time. The director decides that 15% of the
customers should receive this discount. What are the numbers of minutes they need to wait to
receive the discount?
A. 34.48
B. 21.68
C. 38.32
D. 25.52 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Normal Distribution 1521 Chapter 01  An Introduction to Business Statistics 122. Suppose that the waiting time for a license plate renewal at a local office of a state motor
vehicle department has been found to be normally distributed with a mean of 30 minutes and
a standard deviation of 8 minutes. Complete the following statement: Only 20% of the
individuals wait less than _____ minutes.
A. 36.72
B. 23.28
C. 34.63
D. 25.37 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Normal Distribution 123. A set of final examination grades in a calculus course was found to be normally
distributed with a mean of 69 and a standard deviation of 9.
What is the probability of getting a grade of 91 or less on this exam?
A. 1.00
B. 0.50
C. 0.0073
D. .9927 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Normal Distribution 1522 Chapter 01  An Introduction to Business Statistics 124. A set of final examination grades in a calculus course was found to be normally
distributed with a mean of 69 and a standard deviation of 9.
What percentage of students scored between 65 and 89?
A. .6568
B. 1.000
C. .9868
D. .3300 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 125. A set of final examination grades in a calculus course was found to be normally
distributed with a mean of 69 and a standard deviation of 9.
What percentage of students scored between 81 and 89?
A. .0668
B. .0132
C. .0536
D. .0529 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 1523 Chapter 01  An Introduction to Business Statistics 126. A set of final examination grades in a calculus course was found to be normally
distributed with a mean of 69 and a standard deviation of 9.
Only 5% of the students taking the test scored higher than what grade?
A. 70.04
B. 67.96
C. 55.48
D. 82.52 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Normal Distribution 127. A manufacturer of personal computers sets tests competing brands and finds that the
amounts of energy they require are normally distributed with a mean of 285 kwh and a
standard deviation of 9.1 kwh.
If the lowest 25% and the highest 30% are not included in a second round of tests, what are
the upper and lower limits for the energy amounts of the remaining sets?
A. [269.76 300.24]
B. [269.76 289.78]
C. [280.22 289.78]
D. [280.22 300.24] AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Normal Distribution 1524 Chapter 01  An Introduction to Business Statistics 128. While conducting experiments, a marine biologist selects water depths from a uniformly
distributed collection that vary between 2.00 m and 7.00 m. What is the probability that a
randomly selected depth is less than 3.60 m?
A. .72
B. .80
C. .46
D. .32 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Easy
Topic: Uniform Distribution 129. While conducting experiments, a marine biologist selects water depths from a uniformly
distributed collection that vary between 2.00 m and 7.00 m. What is the probability that a
randomly selected depth is between 2.25 m and 5.00 m?
A. .79
B. .45
C. .55
D. .50 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Uniform Distribution 1525 Chapter 01  An Introduction to Business Statistics 130. While conducting experiments, a marine biologist...
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 Winter '14
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