Question: A Single Automated Teller Machine (ATM) is located on the ground floor of a popular shopping mall. Service time at this machine is exponentially distributed.

A Single Automated Teller Machine (ATM) is
A Single Automated Teller Machine (ATM) is located on the ground floor of a popular shopping mall. Service time at this machine is exponentially distributed. On average, the ATM machine can serve a customer in 3 minutes. Customer arrivals at the machine are Poisson distributed, with an average of 18 customers an hour. Relevant formulas to analyze this M/M/1 model are available in your textbook What percent of the time is this machine idle? a. 50% b. 90% c. 10% d. 70% e. 30%

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