1. (Average Flow Time) If mean service time ___ or standard deviation of service times ___, average flow time (W) increases. A. increases, increases B. increases, decreases C. decreases, increases D. decreases, decreases

2.(American Vending 1 u)* American Vending supplies vended food to a large university. Because students often kick the machines out of anger and frustration, management has a constant repair problem. The machines break down in a mean of 3 hours with a standard deviation of 3 hours. One repair worker can service one machine in a mean of 2 hours with a standard deviation of 2 hours. Currently, THREE repair workers are hired. The probability of a repair worker being busy is ___. (*Show calculations.) A. 0.67 B. 0.45 C. 0.33 D. 0.22 E. 0.17 3.(American Vending 1 L)* American Vending supplies vended food to a large university. Because students often kick the machines out of anger and frustration, management has a constant repair problem. The machines break down in a mean of 3 hours with a standard deviation of 3 hours. One repair worker can service one machine in a mean of 2 hours with a standard deviation of 2 hours. Currently, TWO repair workers are hired. Average flow time (W) was calculated as 2.305 from the posted queueing template. --- Average down machines in the entire system (L) are ___. (*Show calculations.) A. 1.07 B. 0.97 C. 0.87 D. 0.77 E. 0.67

show explanation to question 2 and 3