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I am the only bank teller on duty at my local bank. I need to run...

I am the only bank teller on duty at my local bank. I need to run out for 20 minutes, but I do not want to miss any customers. Suppose the arrival of customers can be modeled by a Poisson distribution with mean 3 customers per hour. What’s the probability that 5 or more people arrive in the next 20 minutes? Give your answer to 4 decimal places.

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for 4 decimal places the ans is 0.0037

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