Calculating mean absolute deviation

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Reference no: EM13107766

Since May of 2005, the purchase manager at a department store has been using a 4-period moving average to forecast sales in upcoming months. Sales data for the months of January through July are given in the table below.

Month	Sales
Jan	65
Feb	65
Mar	41
Apr	50
May	63
Jun	38
Jul	72

Compute the mean absolute deviation (MAD) for the four-period moving average forecasts. The forecast values are calculated with an accuracy of two decimal digits. Specify the MAD as a whole number by rounding.

Reference no: EM13107766

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