John Stamp operates a machine in a shop. Jobs arrive at John's machine from an earlier workstation according to a Poisson process at the rate of two per day. The time it takes to set up the machine and run a job is exponentially distributed, with an average time of 3.5 hours. John normally works an 8 hours per day. Compute: a) The average time it takes from the moment a job arrives at John's machine until it is completed by John's, and the average number of jobs that are waiting for John