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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 five per hour.

What is the probability that exactly four arrivals occur during a particular hour?

What is the probability that at least two people arrive during a particular hour?

How many people do you expect to arrive in a 90-min period?

Math   Statistics-And-Probability   
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