The average endurance time of a battery released by a battery-producing factory is 15 months, and the standard deviation is 1.5 months. If it is accepted that the endurance times of batteries show a normal distribution, what should be the warranty period so that no more than 5% of the batteries are replaced.

The average endurance time of a battery released by a battery-producing factory is 15 months, and the standard deviation is 1.5 months. If it is accepted that the endurance times of batteries show a normal distribution, what should be the warranty period so that no more than 5% of the batteries are replaced.

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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