Demand for weeks 1, 2, 3 and 4 is 109, 115, 125 and 150. With weights of 0.6, 0.25 and 0.15, (highest weight to most recent week), a weighted 3-week moving average forecast for week 5 is:

a 138.50

b 122.75

c 112.90

d 97.00

e 120.10

Which of the following is not a general approach to decision-making?

a Establishing priorities

b Systems approach

c Trade off analysis

d Subjective approach

e Quantitative approaches

A vending machine has constant service of 20 seconds per product and customers arrive at a mean rate of 2 per minute. What is the average number of customers waiting in line?

a 0.056

b 1.33

c 0.0056

d 0.33

e 0.67