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Probability question on expected value and approximate probability. 4. The lifetimes of computer chips produced by a certain manufacturer are exponentially dis- tributed with the

Probability question on expected value and approximate probability.

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4. The lifetimes of computer chips produced by a certain manufacturer are exponentially dis- tributed with the mean (expected value) of 1.4 x 106 hours. What is the approximate probability that a batch of 100 chips will contain at least 60 whose lifetimes are less than 1.2 X 106

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