QUESTION $3$

The Walmart Store on MD Route $301$ at Bowie has experienced the following demand for its Refrigerators during the last six months

$\backslash$table$[[$Months$,$Sales,WMA$-3,$MA$-2,$Error$^2],[1,56,-,-,],[2,61,-,-,-],[3,55,-,,],[4,60,,,],[5,66,,,],[6,-,,,]]$

$($a$)$ Provide a forecast by using a $3-$month weighted moving average technique with weights $3,2,$ and being the most recent$).$

$($b$)$ Forecast sales using a $2-$year moving average technique.

$($c$)$ What is the MSE from the $2-$year moving average?