Given the following historical demand, what is the $3-$period $($n$=3)$ moving average forecast for Week $6?$

Week $1=10000$

Week $2=9000$

Week $3=8000$

Week $4=7000$

Week $5=6000$

Week $6=$ Predict using the $3-$period $($n$=3)$ moving average forecast

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