Question: 3 ) . For the weighted average method of forecasting we have been advised that we are 6 0 % confident in the prediction of

3). For the weighted average method of forecasting we have been advised that we are 60% confident in the prediction of next month's sales based on last month, 30% on data from 2 months ago, and 10% on data from 3 months ago.
Use Sum Product to calculate the weighted average

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