A copying facility gives shorter jobs priority over long jobs. Interarrival times for each type of job are exponential, and an average of 12 short jobs and 6 long jobs arrive each hour. Let type 1 job = short job and type 2 job = long job. Then we are given that Determine the average length of time each type of job spends in the copying facility.

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E(S) 2 minutes E(S) = 6 minutes = hour 600 1 = E(S2) 4 minutes E(S) = 18 minutes hour 200