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if the number of the customer entering the starbucks during...

Question: if the number of the customer entering the starbucks during...

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If the number of the customer entering the Starbucks during 8am to 9am following thePoisson distribution with λ 20 customer/hour. Please do the following (1) What is the probability that NO customer comes in between 8-9am? (2) What is the probability that at least 4 customers will come between 8-9am? (3) What is the average number of customers will come between 8:00am to 8:30pm (30 minutes)?

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