Question: A department has one word processing operator Documents produced in the

A department has one word-processing operator. Documents produced in the department are delivered for word processing according to a Poisson process with an expected interarrival time of 20 minutes. When the operator has just one document to process, the expected processing time is 15 minutes. When she has more than one document, then editing assistance that is available reduces the expected processing time for each document to 10 minutes. In both cases, the processing times have an exponential distribution.
(a) Construct the rate diagram for this queueing system.
(b) Find the steady-state distribution of the number of documents that the operator has received but not yet completed.
(c) Derive L for this system.

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