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Author Question: A certain brand of batteries has a lifetime that has a normal distribution with a mean of 3,750 ... (Read 79 times)

WhattoUnderstand

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on: Jun 24, 2018
A certain brand of batteries has a lifetime that has a normal distribution with a mean of 3,750 hours and a standard deviation of 300 hours. What lifetime should the manufacturer advertise for these batteries in order that only 2 of the lamps will wear out before the advertised lifetime?

Question 2

A certain brand of batteries has a lifetime that has a normal distribution with a mean of 3,750 hours and a standard deviation of 300 hours. What proportion of these batteries will last between 3,800 and 4,100 hours?


Sierray

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Reply #1 on: Jun 24, 2018
Answer to Question 1

3135

Answer to Question 2

0.3115


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