Mathematics, 30.10.2019 03:31 iibabycarrotsii

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 between 25 and 30 batteries (inclusive) will last at least 8 hours

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