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A local restaurant has recorded the demand for bottled water in each of the last 15 months of business

Accounting

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A local restaurant has recorded the demand for bottled water in each of the last 15 months of business. Use the recorded demand data below to develop three-period and four-period moving-average forecasts for bottles of water.

(Weights are t = 0.3, t-1 = 0.2, t-2 = 0.3 and t-3 = 0.2)

What is the MAPE for the three-period weighted moving average forecast as of period 15?