
Consider the barber shop modeled as an M/G/1 system with input rate A and service time probability density function b(x) with moments E[X*]. However, whenever a customer finishes service, he will, with probability p, return to the service center for exactly 5 more seconds of service because the barber forgot to wipe his face clean of hair. Each customer will do this at most once. Find the mean waiting time E j in terms of λ.
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