Sales of Volkswagen's popular Beetle have grown steadily at auto dealerships in Nevada during the past 5 years (see table below).

Year	Sales
1	450
2	510
3	518
4	563
5	580

a) Forecasted sales for year 6 using a 3-year moving average is

nothing

sales (round your response to one decimal place).

b) The MAD for a three year moving based forecast is ___ sales (round your response to one decimal place).

c) The MSE for a 3 year moving average based forecast is ____ sales (round to the nearest whole number)