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Customers arrive at a bank at a Poisson rate

Customers arrive at a bank at a Poisson rate λ. Suppose that two customers arrived during the first hour. What is the probability that

(a) Both arrived during the first 20 minutes?

(b) At least one arrived during the first 20 minutes?

(a) Both arrived during the first 20 minutes?

(b) At least one arrived during the first 20 minutes?

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