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June 30, 2015

Homework Help: stats

Posted by cate on Sunday, March 10, 2013 at 8:45am.

Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30.

What is the probability that fewer than 40 batteries will last at least 8 hours?

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