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A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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
Transcribed Image Text:The average life of a certain type of small electric motor
is 10-years with standard deviation of 2-years. The
manufacturer replaces free all motors that fail while
under guarantee. If he is willing to replace only 3% of
the motors that fail, how long a guarantee should he
offer? Assume that the lives of the motors follow norma!
distribution.
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