Suppose That the Waiting Time for a License Plate Renewal

Multiple Choice

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.Suppose that in an effort to provide better service to the public,the director of the local office is permitted to provide discounts to those individuals whose waiting time exceeds a predetermined time.The director decides that 15% of the customers should receive this discount.What are the numbers of minutes they need to wait to receive the discount?

A) 34.48
B) 21.68
C) 38.32
D) 25.52