Question $6(15$ points$)$

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Given the following sales data:

Year $1,$ Spring: $101$

Year $1,$ Summer: $45$

Year $1,$ Fall: $79$

Year $1,$ Winter: $28$

Year $2,$ Spring: $104$

Year $2,$ Summer: $40$

Year $2,$ Fall: $70$

Year $2,$ Winter: $21$

Forecast sales for Spring, Year $3$ using the seasonal model.

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