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At present the Economics department and the Sociology department each has one typist who can type…


At present the Economics department and the Sociology department each has one typist who can type 25 letters a day. Economics requires an average of 20 letters per day, while Sociology requires only average of 15. Assuming Poisson arrival and exponentially distributed typing times find (a) the average queue length and average waiting time in each departments (b) the average overall waiting time if they merge their resources to form a typing pool.