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The number of people arriving for treatment at an emergency room can be modeled by a...

The number of people arriving for treatment at an emergency room can be modeled by a Poisson process with a rate parameter of four per hour.

(a) What is the probability that exactly two arrivals occur during a particular hour? (Round your answer to three decimal places.)

(b) What is the probability that at least two people arrive during a particular hour? (Round your answer to three decimal places.)

(c) How many people do you expect to arrive during a 15-min period? people

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