The Following Data Summarizes the Historical Demand for a Product

Short Answer

The following data summarizes the historical demand for a product:
$$\begin{array} { | l | c | } \hline \text { Month } & \begin{array} { c } \text { Actual } \\\text { Demand }\end{array} \\\hline \text { March } & 20 \\\hline \text { April } & 25 \\\hline \text { May } & 40 \\\hline \text { Tune } & 35 \\\hline \text { Tuly } & 30 \\\hline \text { August } & 45 \\\hline\end{array}$$
-If the forecasted demand for June, July, and August is 32, 38 and 42, respectively, what is MSE?