Many of a bank’s customers use its automatic teller machine to transact business after normal banking hours. During the early evening hours in the summer months, customers arrive at a certain location at the rate of one every other minute. This can be modeled using a Poisson distribution. Each customer spends an average of 83 seconds completing his or her transactions. Transaction time is exponentially distributed.
a. Determine the average time customers spend
at the machine, including waiting in line and completing
transactions. (Do not round intermediate calculations.
Round your answer to the nearest whole number.)
Average time ______ minutes
b. Determine the probability that a customer will
not have to wait upon arriving at the automatic teller machine.
(Round your answer to 2 decimal places.)
Probability ______
c. Determine the average number of customers
waiting to use the machine. (Round your answer to 2 decimal
places.)
Average number ______ customers
ANSWER: Arrival rate = 30 per hour
Service rate = 43.37 per hour
a)
Average time customers spend at the machine W
W=1(/service rate-Arrival rate)
W = 1/ (43.37-30) = 0.075 hours or 4.49 minutes
b) The probability that a customer will not have to wait upon arriving at the automatic teller machine= 1-Arrival rate/service rate
1-30/43.37 =0.31
Probability= 0.31
Many of a bank’s customers use its automatic teller machine to transact business after normal banking...
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