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.

$$

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Part $1$

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 $16$