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July 5, 2015

Homework Help: stats

Posted by michelle on Sunday, July 31, 2011 at 10:12pm.

A manufacturer of automobile batteries claims that the distribution of battery life is
54 months with a standard deviation of 6 months. We take a random sample of 50 batteries.
a. Find the probability that their mean life is less than 52 months.
b. Find the probability that their mean life is more than 53 months.

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