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Suppose that the time (in hours) required to repair a machine is an exponentially distributed random...

Suppose that the time (in hours) required to repair a machine is an exponentially distributed random variable with parameter λ=0.2. What is
(a) the probability that a repair takes less than 3 hours?  
(b) the conditional probability that a repair takes at least 11hours, given that it takes more than 8 hours?

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