Let Y be the life in hours of a battery. Assume Y is normally distributed with mean 200 and variance o?. If a purchaser of such batteries requires that at least 90% of the batteries have lives exceeding 150 hours, what is the largest value o can be and still have the purchaser satisfied?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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Let Y be the life in hours of a battery. Assume Y is normally distributed with mean 200 and
variance o?. If a purchaser of such batteries requires that at least 90% of the batteries have
lives exceeding 150 hours, what is the largest value o can be and still have the purchaser
satisfied?
Transcribed Image Text:Let Y be the life in hours of a battery. Assume Y is normally distributed with mean 200 and variance o?. If a purchaser of such batteries requires that at least 90% of the batteries have lives exceeding 150 hours, what is the largest value o can be and still have the purchaser satisfied?
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