Question: A second cashier is added to the grocery store in Problem 13-37, and this cashier works at the same rate as the original one. Assume

A second cashier is added to the grocery store in Problem 13-37, and this cashier works at the same rate as the original one. Assume the arrival rate does not change.

(a) What is the average length of the line?

(b) How many minutes does the average customer spend waiting in line?

(c) How many minutes typically elapse from the time the person enters the line until the person pays the cashier and leaves the system?

(d) Find the probability that the number in the system is 1, 2, and 3.

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