$$c$)$ Using the$3-$year weighted moving average with weights $0\mathrm{.}10,0\mathrm{.}30,$ and $0\mathrm{.}60,$ using $0\mathrm{.}60$ for the most recent$$ period, provide the forecast from periods $4$ through $12($round your responses to two decimal$$ places$).$

Year

$4$

$5$

$6$

$7$

$8$

$9$

$10$

$11$

$12$

Forecast

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Part $4$

$$d$)$ Mean absolute deviation for the forecast developed using the$3-$year moving average is $2\mathrm{.}20$ and for the$3-$year weighted moving average is $2\mathrm{.}60.$ Based on this$$ information, the better forecast is achieved using the