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Problem on queuing diagram

Draw a queuing diagram for the systems below and describe them using Kendall’s notation:

A) Single CPU system

B) 4 CPU system, where the arrival times are distributed according to fig a and the service times according to fig b. Requests are serviced according to priorities, with higher priority request pre-empting lower priority ones.

C) A system comprising three web servers, to which requests are randomly directed. Each of the servers contains two CPUs.

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