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July 30, 2014

Homework Help: statistics

Posted by Camela on Wednesday, December 26, 2012 at 9:14pm.

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 .70 and has failed with a probability of .30. What is the probability that between 25 and 30 batteries (inclusive) will last at least 8 hours?

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