The following is the monthly sales of mugs of Budweiser at the Sports Page during $2001.$

Compute a$3-$month moving average demand forecast for December.

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Part $1$

Actual

Month Sales$($in $100$s$)$

January $20$

February $21$

March $17$

April $20$

May $15$

June $14$

July $16$

August $18$

September $23$

October $20$

November $21$

December $13$