Little's Law Problems(Group 1).docx

# Longest accounting 55 years shortest marketing and

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So it follows that T(10/110)+2T(60/110)+5T(40/110) = 3T 3T = 4.5 years T = 1.5 years T = the time a drop-out spends at CSUN = 1.5 years 2T: time to graduate for a transfer student = 3 years 5T: Time to graduate for a freshman: 5T = 7.5 years Example 3: Fresh Juice A recent CSUN graduate has opened up a cold beverage stand “CSUN-STAND” in Venice Beach. She works 8 hours a day and observes that on average there are 320 customers visiting CSUN-STAND every day. She also notes that on average a customer stays in line at the stand for 6 minutes. a) How many customers on average are waiting at CSUN-STAND? A) 4 B) 2.75 C) 3.75 D) 3.25 E) 4.25 She is thinking about running a marketing campaign to boost the number of customers per day. She expects that the number of customers will increase to 480 per day after the campaign. She wants to keep the line short at the stand and hopes to have only 2 people waiting on the average. Thus, she decides to hire an assistant. b) What is the average time a customer will wait in the system after all these changes? A) 4 min B) 3 min C) 2 min D) 1 min E) none of the above c) After the marketing campaign, a recent UCLA graduate has opened up a competing cold beverage stand. The UCLA grad is not as efficient as the CSUN grad, so customers must stay an average of 10 minutes at “UCLA-STAND.” Suppose there is an average of 3 customers at UCLA-STAND. The total number
of customers for both CSUN- and UCLA- STANDs remains at 480 per day, as it was after the marketing campaign. But now it is divided between the CSUN- STAND and UCLA- STAND.
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