The Don't$-$Drink$-$and$-$Drive mountain bike dealer in the Spokane area wants to be able to forecast accurately the demand for the Don't$-$Drink$-$and$-$Drive $2120$ VT bike. From sales records, the dealer has accumulated the following data for the year $2001.$

Compute a $3-$month moving average forecast of demand for the period :Jan, February, and March.

$\backslash$table$[[$Month$,,$Sales$],[$January$,9,],[$February$,7,],[$March$,,10],[$April$,8,],[$May$,7,],[$June$,12,],[$July$,10,],[$August$,11,],[$September$,12,],[$October$,10,],[$November$,14,],[$December$,16,]]$