An ATM at a busy airport disburses money or accepts deposits from customers. The ATM takes a

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An ATM at a busy airport disburses money or accepts deposits from customers. The ATM takes a constant time of 2 minutes to accept instructions and complete a transaction. If customers arrive at the rate of 20 per hour (Poisson distributed),
a. Determine the average length of the waiting line.
b. Determine the average time customers wait.

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