According to the federal highway administration
Course:- Basic Statistics
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According to the Federal Highway Administration's

2006 highway statistics, the distribution of ages for licensed drivers has a mean of 47.5 years and a standard deviation of 16.6 years Assuming the distribution of ages is normally distributed, what percentage of the drivers are:

a. between the ages of 17 and 22?

b. younger than 25 years of age?

c. older than 21 years of age?

d. between the ages of 48 and 68?

e. older than 75 years of age?

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