1. The average age of vehicles registered in the United States is 96 months. Assume the population

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QUESTION:

1. The average age of vehicles registered in the United States is 96 months. Assume the population is normally distributed with a standard deviation of 15 months. Find the probability that the average age of a sample of 36 vehicles is between 98 and 100 months?

a. 6.4%

b. 28.8%

c. 44.5

d. 15.7%

2. If a normally distributed group of test scores have a mean of 70 and a standard deviation of 12. Find the percentage of scores that will fall below 50.

a. 4.75%

b. 6.75%

c. 35.54%

d. 45.25%


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