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Homework  Technical Note 7
1.
Students arrive at Administrative Services Office at an average of one every 15
minutes, and their requests take on average 10 minutes to be processed. The service
encounter is staffed by only one clerk, Judy Gumshoes, who works eight hours per day.
Assume Poisson arrivals and exponential service times.
a. What percentage of time is Judy idle?
b. How much time, on average, does a student spend waiting in line?
c. How much is the (waiting) line on average?
d. What is the probability that an arriving student (just before entering the Administrative
Services Office) will find at least one other student waiting in line?
2
. The managers of the Administrative Services Office estimate that the time a student
spends waiting in line costs them (due to goodwill loss and so on) $10 per hour. To
reduce the time a student spends waiting, they know that they need to improve Judy’s
processing time (see problem 1). They are currently considering the following two
options:
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 Fall '10
 CHANG
 Management

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