Consider a closed queueing network consisting of two customers moving among two servers, and suppose that after each service completion the customer is equally likely to go to either server—that is, P1,2 = P2,1 =1 2. Let μi denote the exponential service rate at server i, i = 1, 2.

(a) Determine the average number of customers at each server.

(b) Determine the service completion rate for each server.