Question: A study shows that employees that begin their work day at 9:00 a.m. vary their times of arrival uniformly from 8:40 a.m. to 9:30 a.m.

A study shows that employees that begin their work day at 9:00 a.m. vary their times of arrival

uniformly from 8:40 a.m. to 9:30 a.m. The probability that a randomly chosen employee reports

to work between 9:00 and 9:15 is:

A. 40%

B. 30%

C. 20%

D. 10%

It has been reported that the average time to download the home page from a government

website was 0.9 seconds. Suppose that the download times were normally distributed with a

standard deviation of 0.3 seconds. If random samples of 36 download times are selected, what is

the probability that the sample mean will be more than 0.84 seconds?

A. .1151

B. .4522

C. .8849

D. .5478

It has been reported that the average time to download the home page from a government

website was 0.9 seconds. Suppose that the download times were normally distributed with a

standard deviation of 0.3 seconds. If random samples of 36 download times are selected, what

is the probability that the sample mean will be less than 0.84 seconds?

A. .1151

B. .4522

C. .8849

D. .5478

The life of a light bulb is exponentially distributed with a mean of 1,000 hours. What is the

probability that the bulb will last:

More than 1,200 hours?

A. .3012

B. .3679

C. .4345

D. .6988

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. .9392

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