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Part $1$

Develop a$$ three$-$period moving average forecast for periods $13$minus$15.$

Period

Demand

$10$

$242$

$11$

$339$

$12$

$398$

$13$

$253$

$14$

$481$

Part $2$

Calculate the forecasts for periods $13$minus$15$ by using a$$ three$-$period moving average model $($enter your responses rounded to the nearest whole$$ number$).$