On average, 50 customers arrive per hour at a small post office. Inter-arrival times are exponentially distributed.
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On average, 50 customers arrive per hour at a small post office. Inter-arrival times are exponentially distributed. Each window can serve an average of 25 customers per hour. Service times are exponentially distributed. It costs $25 per hour to open a window, and the post office values the time a customer spends waiting in line at $15 per customer hour. To minimize expected hourly costs, how many postal windows should be opened?
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