In Problem 28 when the students come back for fall
In Problem 28, when the students come back for fall semester, the Sub Shop experiences a large increase in demand for about a month before it begins to level off again, such that the number of phone orders increases to an average of 8 per hour (Poisson distributed). If the shop now assumes that service times are exponentially distributed, with a mean of 20 minutes, how many delivery people will it need to provide a reasonable service level?

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