Consider a machine where jobs are being processed. The mean production time is 6 minutes and the standard deviation is 2 minutes per job. The mean number of jobs arriving per hour is 7. Suppose that the inter-arrival times are exponentially distributed.
Determine the mean waiting time of the jobs._______ minutes
What fraction of the time is the machine idle?________
What is the average time for a job to be completed?________ minutes
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