Question: On a typical weekend evening at a local hospital, the number of persons waiting for treatment in the emergency room is Poisson distributed with

On a typical weekend evening at a local hospital, the number of persons waiting for treatment in the emergency room is Poisson distributed with λ = 6.5.

(a) What is the likelihood that either no one or only one person is waiting for treatment?

(b) What is the likelihood that no more than four persons are waiting?

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