Problem $4($Eight marks$)$The following table shows the demand for acertain product for eight quarters. Forecast the

demand for the last six quarters for these data using the centered moving average method:

The following table shows the demand for a certain product for eight quarters. Forecast the

demand for the last six quarters for these data using the centered moving average method:

Year $12$

Quarter $12341234$

Demand $6067473852534328$