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Thanks in advance for your help. 2. Customers arrive at a bank at a Poisson rate A. Suppose that three customers arrived during the first

Thanks in advance for your help.
2. Customers arrive at a bank at a Poisson rate A. Suppose that three customers arrived during the first hour. What is the (conditional) probability that (a) (5 points) all of them arrived during the first 30 minutes? (b) (5 points) at least one arrived during the first 20 minutes

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