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4. (10 pts) The time to repair a car is an exponentially distributed random variable with parameter 04. That is, the repair time, X

4. (10 pts) The time to repair a car is an exponentially distributed random variable with parameter 04. That is, the repair time, X ~Exp(1/4). If the repair time exceeds 6 hours what is the probability that it exceeds 9 hours?

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