The lifetime of a certain type of battery is normally distributedwith mean value 10 hours and standard deviation1 hour. There are four batteries in a package. What lifetimevalue is such that the total lifetime of all batteries ina package exceeds that value for only 5% of all packages?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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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 lifetime of a certain type of battery is normally distributed
with mean value 10 hours and standard deviation
1 hour. There are four batteries in a package. What lifetime
value is such that the total lifetime of all batteries in
a package exceeds that value for only 5% of all packages?

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