The bank manager of a busy downtown location found herself unable to find good teller help so she invested in an ATM to handle the routine withdrawals that tended to occupy an inordinate amount the teller's time
Before she installed the ATM she found that customers were arriving on average every 2 minutes (Poisson distributed) and it took a teller 30 seconds (exponentially distributed) to process their request. The ATM is able to maintain a constant 30 second service time. What is the impact on system utilization?
A) There is no change.
B) Utilization has dropped by 15%.
C) Utilization has dropped by 30%.
D) Utilization has dropped by 45%.
Answer: A
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