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You are the only bank teller on duty and you want to take a break for 10 minutes but you don't want to miss any

You are the only bank teller on duty and you want to take a break for 10 minutes but you don't want to miss any customers. Suppose the arrival of customers can be models by a Poisson distribution with mean of 2 customers per hour. What's the probability that 2 or more people arrive in the next 10 minutes?

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