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3. The times between patient arrivals to an emergency room follow an exponential probability distribution, the mean of which is 20 minutes. a. What is

3. The times between patient arrivals to an emergency room follow an exponential probability distribution, the mean of which is 20 minutes.

a. What is the probability that arrival times between patients are 20 minutes or less?

b. What is the probability that arrival times between patients will be 30 minutes or less?

c. What is the probability that more than one hour passes between the arrival times?

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