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. Complete the following statement: Only 20 percent of the individuals wait less than ________ minutes.
A) 36.72
B) 23.28
C) 34.63
D) 25.37

Question

Quizplus · Accepted Answer

z_.20 = −.84 = (x − 30)/8 = −6.72 + 30 x = 23.28

Suppose That the Waiting Time for a License Plate Renewal