5-17 Data collected on the yearly demand for 50-pound bags of fertilizer at Wallace Garden Supply are shown in the following table. Develop a 3-year moving average to forecast sales. Then estimate demand again with a weighted moving average in which sales in the most recent year are given a weight of 2 and sales in the other 2 years are each given a weight of 1. Which method do you think is best?

Year Demand for Fertilizer

(1,000s of Ba gs)

1 4 2 6 3 4 4 5 5 10 6 8 7 7 8 9 9 12 10 14 11 15