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18. Suppose that the longevity of a light bulb is exponential with a mean lifetime = 8 years. a) Find the probability that a

18. Suppose that the longevity of a light bulb is exponential with a mean lifetime = 8 years. a) Find the probability that a light bulb lasts less than 1 year. b) Find the prob. that a bulb lasts between 6 and 10 years.

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