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December 22, 2014

Homework Help: Math

Posted by Anonymous on Wednesday, October 7, 2009 at 2:46pm.

A certain type of thermal battery for an airplane navigation device backup power has a mean life of 300 hours with a standard deviation of 15 hours. Assume a normal distribution of backup power device lives. What proportion of these batteries can be expected to have lives of 322 hours or less?

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