According to statistics the distribution of ages for licensed drivers has a mean of 44.5 years and a standard deviation of 18.7 years. Assuming the distribution of ages is normally distributed, what percentage of the drivers are the following. (Round your answers to one decimal place.)
(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 45 and 65
(e) older than 75 years of age