Unformatted text preview: 1.00 106. At an oceanside nuclear power plant, seawater is used as part of the cooling system.
This raises the temperature of the water that is discharged back into the ocean. The amount
that the water temperature is raised has a uniform distribution over the interval from 10 to
25ºC.
What is the probability that the temperature increase will be between 20 and 22ºC?
A. 0.08
B. 0.88
C. 0.13
D. 0.20 1459 Chapter 01  An Introduction to Business Statistics 107. At an oceanside nuclear power plant, seawater is used as part of the cooling system.
This raises the temperature of the water that is discharged back into the ocean. The amount
that the water temperature is raised has a uniform distribution over the interval from 10 to
25ºC.
Suppose that a temperature increase of more than 18ºC is considered to be potentially
dangerous to the environment. What is the probability that at any point of time, the
temperature increase is potentially dangerous?
A. 0.47
B. 0.72
C. 0.28
D. 0.50 108. At an oceanside nuclear power plant, seawater is used as part of the cooling system.
This raises the temperature of the water that is discharged back into the ocean. The amount
that the water temperature is raised has a uniform distribution over the interval from 10 to
25ºC.
What is the expected value of the temperature increase?
A. 7.50
B. 4.33
C. 17.50
D. 10.12 109. At an oceanside nuclear power plant, seawater is used as part of the cooling system.
This raises the temperature of the water that is discharged back into the ocean. The amount
that the water temperature is raised has a uniform distribution over the interval from 10 to
25ºC.
What is the standard deviation of the temperature increase?
A. 10.12
B. 4.33
C. 7.50
D. 1.25 1460 Chapter 01  An Introduction to Business Statistics 110. During the past six months, 73.2% of US households purchased sugar. Assume that these
expenditures are approximately normally distributed with a mean of $8.22 and a standard
deviation of $1.10.
Find the probability that a household spent less than $5.00
A. .9983
B. 0.000
C. 1.00
D. 0.0017 111. During the past six months, 73.2% of US households purchased sugar. Assume that these
expenditures are approximately normally distributed with a mean of $8.22 and a standard
deviation of $1.10.
Find the probability that a household spent more than $10.00
A. .7320
B. .9474
C. .0526
D. .2680 112. During the past six months, 73.2% of US households purchased sugar. Assume that these
expenditures are approximately normally distributed with a mean of $8.22 and a standard
deviation of $1.10.
Find the probability that a household spent more than $16.00
A. 1.00
B. 0.00
C. 0.50
D. 0.98 113. During the past six months, 73.2% of US households purchased sugar. Assume that these
expenditures are approximately normally distributed with a mean of $8.22 and a standard
deviation of $1.10. What proportion of the households spent between $5.00 and $9.00?
A. .7611
B. .7628
C. .0017
D. .7594 1461 Chapter 01  An Introduction to Business Statistics 114. During the past six months, 73.2% of US households purchased sugar. Assume that these
expenditures are approximately normally distributed with a mean of $8.22 and a standard
deviation of $1.10. 99% of the households spent less than what amount?
A. $5.66
B. $10.78
C. $6.81
D. $9.63 115. During the past six months, 73.2% of US households purchased sugar. Assume that these
expenditures are approximately normally distributed with a mean of $8.22 and a standard
deviation of $1.10. 80% of the households spent more than what amount?
A. $7.30
B. $7.38
C. $9.06
D. $9.14 116. Suppose that the times required for a cable company to fix cable problems in its
customers' homes are uniformly distributed between 40 minutes and 65 minutes.
What is the probability that a randomly selected cable repair visit will take at least 50
minutes?
A. .77
B. .40
C. .60
D. .23 117. Suppose that the times required for a cable company to fix cable problems in its
customers' homes are uniformly distributed between 40 minutes and 65 minutes.
What is the probability that a randomly selected cable repair visit falls within 2 standard
deviations of the mean?
A. 0.75
B. 1.00
C. 0.58
D. 0.86 1462 Chapter 01  An Introduction to Business Statistics 118. 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 between 15 and 45 minutes?
A. 1.00
B. .9699
C. .5000
D. .9398 119. 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 at least 10 minutes?
A. .9938
B. .8944
C. .1056
D. .0062...
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