The average length of time, in minutes, that a customer waits in line for service is given byW(x, y) = 60x − y, y < xwhere y is the average arrival rate, written as the number of customers per hour, and x is the average service rate, written in customers per hour. Evaluate each of the following. The average length of time, in minutes, that a customer waits in line for service is given byW(x, y) =y < xwhere y is the average arrival rate, written as the number of customers per hour, and x is the average service rate, written in customers per hour. Evaluate each of the following.(a) w(9, 7)min(b)W(8, 3)min(c) W(9, 6)min(d) W(12, 8)min

This can be evaluated as follows:

The average length of time, in minutes, that a customer waits in line for service is given by 60 y < X - y W(x, y) = where y is the average arrival rate, written as the number of customers per hour, and x is the average service rate, written in customers per hour. Evaluate each of the following. (a) W(9, 7) min (b) W(8, 3) min (c) W(9, 6) min (d) W(12, 8) min