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QUESTION

The first column of the following data refers to the months. The second column is the monthly demand of a particular product.

The first column of the following data refers to the months. The second column is the monthly demand of a particular product. The third column contains the forecast for that period based on a specific method:

 t    At    Ft

 1   15   17

 2   19   15

 3   11    13

 4   14   11

 5   15   18

 6   16   9

The mean absolute deviation (MAD) is equal to:

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