Question: Suppose that customers arrive one at a time at an ATM at the rate of 7 per hour. Customers take an average of four minutes

Suppose that customers arrive one at a time at an ATM at the rate of 7 per hour. Customers take an average of four minutes to complete their transactions. Customers queue up on a first-come, first-served basis. Assume that there is only one ATM. What is the proportion of time that the ATM is busy? (Provide your answer as a decimal number, not as a fraction or a percentage.)

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