The length of time to discharge a certain Motolite car batteries are normally distributed. It is found that fifteen percent of batteries will last less than thirty hours and ten percent of batteries last more than fifty hours. a) Find the mean of the length of time to discharge the battery. b) Find the standard deviation of the length of time to discharge the battery.

The length of time to discharge a certain Motolite car batteries are normally distributed. It is found that fifteen percent of batteries will last less than thirty hours and ten percent of batteries last more than fifty hours. a) Find the mean of the length of time to discharge the battery. b) Find the standard deviation of the length of time to discharge the battery.

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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