a-call-center-receives-an-average-of-99-calls-per-hour-what-is-the-probability-t

Question

A call center receives an average of $9$ calls per hour. What is the probability that in a randomly chosen hour, the center receives at most $4$ calls? Assume the number of calls follows a Poisson distribution.

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A call center receives an average of 99 calls per hour. What is the probability that in a randomly chosen hour, the center receives at most 44 calls? Assume the number of calls follows a Poisson distribution.

A call center receives an average of $9$ calls per hour. What is the probability that in a randomly chosen hour, the center receives at most $4$ calls? Assume the number of calls follows a Poisson distribution.