The reference desk of a university library receives requests for assistance. Assume that a Poisson probability distribution with an arrival rate of 13 requests per hour can be used to describe the arrival pattern and that service times follow an exponential probability distribution with a service rate of 16 requests per hour. (Round your answers to four decimal places.) (a) What is the probability that no requests for assistance are in the system? (b) What is the average number of requests that will be waiting for service? (c) What is the average waiting time (in hours) before service begins? h

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