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6.- Suppose the length of time (in hours) between emergency arrivals at a certain hospital is modeled as an exponential distribution with = 4.

6.- Suppose the length of time (in hours) between emergency arrivals at a certain hospital is modeled as an exponential distribution with = 4. a) What is the probability that more than 5 hours pass without an emergency arrival? b) Find P(1 x3) c) Find a (approximately) such that P(X a) = 0.19691168

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