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