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Mathematics, 26.03.2020 20:01 deadlydemon0500

Suppose that the time (in hours) required to repair a machine is an exponentially distributed random variable with parameter λ=0.1λ=0.1. What is (a) the probability that a repair time exceeds 99 hours? (b) the conditional probability that a repair takes at least 1212 hours, given that it takes more than 77 hours?

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