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Customers arrive at a bank randomly and independently of each other at an average rate of 2.4 per minute during peak hours. In order to

Customers arrive at a bank randomly and independently of each other at an average rate of 2.4 per minute during peak hours. In order to assign tellers to the various counters, the manager of the bank wants to know the probability that

(a) at least two customers arrive in the next minute?

(b) exactly four customers arrive in the next 3 minutes?

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