A branch of a bank has only one typist since the typing work varies in length the typing rate is randomly distributed approximating a poisson distribution with mean service rate at 8 letters per hour the letters arrive at a rate of 5 per hour during the entire 8 hours work day if the type writer is valued at 2 euros per hour determine
I) equipment utilization
Ii) percent that the arriving letter has to wait
Ii) average system time
iv) average cost due to waiting on the part of the typewriter
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