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11. Suppose that n items are being tested simultaneously, the items are independent, and the length of life of each item has the exponential distribution

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11. Suppose that n items are being tested simultaneously, the items are independent, and the length of life of each item has the exponential distribution with parameter s. Determine the expected length of time until three items have failed. Hint: The required value is E(Y, + Y2 + Yz) in the notation of Theorem 5.7.11

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