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answer the question The time (in minutes) required to repair a machine is an exponentially distributed random variable with parameter A = 1/120. What is

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The time (in minutes) required to repair a machine is an exponentially distributed random variable with parameter A = 1/120. What is a) the probability that a repair time exceeds 120 minutes? b) the conditional probability that a repair takes at least 600 minutes, given that its duration exceeds 540 minutes

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