Question: A single Automated Teller Machine (ATM) is located on the ground floor of a busy building. Service time at this machine is exponentially distributed. On

A single Automated Teller Machine (ATM) is located on the ground floor of a busy building. Service time at this machine is exponentially distributed. On average, the ATM machine can serve a customer in 2 minutes (30 customers an hour). Customer arrivals at the machine are Poisson distributed, with an average of 25 customers an hour. Relevant formulas to analyze this M/M/1 model are available at the back of the exam. Please answer the following question, based on this information. On average, how many people are waiting to use this ATM? A. 4.167 customers B. 5 customers C. 8.333 customers D. 30 customers E. 2 customers

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