The DMV (the place where you get your driver’s license) hires a consultant to do something about all their complaints for wait times. They find that 75% of the visitors get through the line in less than 20 minutes. If the standard deviation of the wait time is 6.2 minutes, find the average wait time per visitor. Can you help ? I've tried but I don't think I am doing right

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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The DMV (the place where you get your driver’s license) hires a consultant to do something about all their
complaints for wait times. They find that 75% of the visitors get through the line in less than 20 minutes. If the
standard deviation of the wait time is 6.2 minutes, find the average wait time per visitor.

Can you help ? I've tried but I don't think I am doing right . 

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