Question: A grocery store has a single queue that is served by checkout stations. On average, 4 5 shoppers arrive per hour. The coefficient of variation

A grocery store has a single queue that is served by checkout stations. On average, 45 shoppers arrive per hour. The coefficient of variation of the interarrival time is equal to 1. The average service time for each station is 18 customers per hour, and the coefficient of variation of the service time is equal to 3. How many checkout stations need to be staffed to ensure that the average time that customers spend waiting in the queue is less than 5 minutes?

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