Using the Data Shown Below, Compute the Mean Square Error

Essay

Using the data shown below, compute the mean square error, mean absolute deviation, and mean absolute percentage error for the forecasts shown.
$$\begin{array} { c c c } \text { Month } & \text { Forecast Demand } & \text { Actual Demand } \\\hline\text { April }& 170 & 180 \\\text { May } & 225 & 200 \\\text { Jure } & 210 & 200 \\\text { July } & 260 & 240 \\\text { August } & 200 & 230\end{array}$$