For the interactive system in Figure, suppose that we are given the following information: mean user think time = 5 seconds expected service time at device i = 0.01 seconds utilization of device i = 0.3 utilization of CPU =0 .5 expected number of visits to device i per visit to CPU = 10. expected number of jobs in the central subsystem (the cloud shape) = 20. expected total time in system (including think time) per job = 50 seconds. How many jobs are there in the queue portion of the CPU on average. E[NQcpu]??

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