Calculus (percent symbol)

Question

A company has a policy of retiring company cars; this policy looks at number of miles driven, purpose of trips, style of car and other features. The distribution of the number of months in service for the fleet of cars is bell-shaped and has a mean of 63 months and a standard deviation of 10 months. Using the empirical rule, what is the approximate percentage of cars that remain in service between 33 and 43 months?

Answer 1

If I understand you correctly, 63 months would be the peak point on the bell curve and since sigma is 10, 33 and 43 are between 2 and 3 standard deviations to the left which represents about 2.1%