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August 23, 2014

Homework Help: Statistics

Posted by jacob on Monday, December 12, 2011 at 10:06pm.

The lifetime of a certain smart phone battery has an
unknown distribution with mean value of 8 hours and
standard deviation of 2 hours. What is the approximate
probability that the average battery lifetime of a sample
of 36 batteries will exceed 8.1 hours?

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