The Mean Absolute Deviation (MAD) for the Forecasts Shown in the Following

Multiple Choice

The mean absolute deviation (MAD) for the forecasts shown in the following table is:
$\begin{array} { | l | l | l | } \hline \text { Month } & \text { Forecast Demand } & \text { Actual Demand } \\\hline \text { April } & 190 & 180 \\\hline \text { May } & 175 & 200 \\\hline \text { June } & 190 & 200 \\\hline \text { July } & 240 & 220 \\\hline \text { August } & 225 & 195 \\\hline\end{array}$

A) more than 10 but less than or equal to 20.
B) more than 20 but less than or equal to 30.
C) more than 30 but less than or equal to 40.
D) more than 40 but less than or equal to 50.