calculate the four-week moving average for the store:

n A++ A-2 + A-1 F = MA = n n where F = Forecast for time period r MA = n period moving average Ar-i = Actual value in period :- i n = Number of periods (data points) in the moving average (3-5) A supermarket uses a four-week moving average to predict future sales of milk. Sales data (in gallons) over the past ten weeks are shown below. Week Sales Week Sales 1 8,000 6 10,000 2 8,000 7 8,000 3 13,500 8 11,000 4 10,500 9 9,000 5 12,000 10 12,000 On the basis of these data, what would be the store's forecast for week 11