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 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. On average, how many people are waiting to use this ATM machine?

a. 2

b. 8

c. 4

d. 10

e. 6

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