Monthly demand over the past $10$ months is given in what follows.

a$.$ Graph the demand.

b$.$ What is your best guess for the demand for month $11?$

c$.$ Using a three$-$month moving average, calculate the forecasts for months $4,5,6,7,8,9,10,$ and $11.$Month

Actual Demand

Forecast

$1$

$102$

$2$

$91$

$3$

$95$

$4$

$105$

$5$

$94$

$6$

$100$

$7$

$106$

$8$

$95$

$9$

$105$

$10$

$98$

$11$