Question: a single automated teller machine (atm) is located on the ground floor in the Student's Union. service time at this machine is exponentially distributed. On

a single automated teller machine (atm) is located on the ground floor in the Student's Union. service time at this machine is exponentially distributed. On average, the ATM machine can serve a customer in 2 minutes. Customers 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 note the following four questions, based on this information. What is the probability that there are no customers at the ATM?

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