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The lifetimes of a certain electronic component are known to be normally distributed with a mean...

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Statistics

The lifetimes of a certain electronic component are known to benormally distributed with a mean of 1,400 hours and a standarddeviation of 600 hours. For a random sample of 25 components theprobability is 0.6915 that the sample mean lifetime is less thanhow many hours?

A)1345

B)1460

C)1804

D)1790

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Given thatmean 1400standard deviation    See Answer
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