a$.$ Use a $3-$month weighted moving average to forecast the sales for the months April through

December. Use weights of $(\frac{3}{6}),\frac{2}{6},$ and $(\frac{1}{6}),$ giving more weight to more recent data.

b$.$ Use exponential smoothing with $=0\mathrm{.}6$ to forecast the sales for the months Aprit through

December. Assume that the initial forecast for January was $$22$ million. Start error