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. Suppose that the longevity of a light bulb is exponential with a mean lifetime of seven 7 years. it) Find the probability that a

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. Suppose that the longevity of a light bulb is exponential with a mean lifetime of seven 7 years. it) Find the probability that a light bulb lasts more than two year. b) Find the probability that a light bulb lasts between six and nine years. c) If a light bulb has lasted seven years. what is the probability that it fails within the 8'\" year

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