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The business analyst for QM Furniture Outlet, Inc. did forecasts for four years demand for specially designed chairs. The actual demands and forecasts were given

The business analyst for QM Furniture Outlet, Inc. did forecasts for four years demand for specially designed chairs. The actual demands and forecasts were given as follows:

Year 2017 2018 2019 2020

Demand 9 8 9 10

Forecast 10 11` 8 12

Calculate the Mean Absolute Deviation (MAD) of forecasts

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