Question: I figured out how to do part A and part B. needing to know how to work out part C. Please work it out so

I figured out how to do part A and part B. needing to know how to work out part C. Please work it out so i can see how you did it?
I figured out how to do part A and part B.
Sales of Volkswagen's popular Beetle have grown steadily at auto dealerships in Nevada during the past 5 years (see table below). Year 1 2 3 4 5 Sales 450 495 518 563 584 a) Forecasted sales for year 6 using a 3-year moving average is 555.0 sales (round your response to one decimal place) b) The MAD for a 3-year moving average based forecast is 67 sales (round your response to one decimal place) c) The MSE for a 3-year moving average based forecast is sales (round your response to the nearest whole number)

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