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A cashier spends an average of 2.9 minutes per customer in a grocery store. Service times have an exponential distribution, and customer arrivals are Poisson
A cashier spends an average of 2.9 minutes per customer in a grocery store. Service times have an exponential distribution, and customer arrivals are Poisson distributed, with an anticipated mean of 18 per hour during store operations. What is the average waiting time in the queue? Please keep at least two decimals and express in minutes (if you got answer in hours, please convert your answer to minutes).
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