Question $8(9$ points$)$

Demand for a product and the forecasting department's forecast $($na$$ve model$)$ for a product are shown below.

Compute the mean square error $($MSE$).$

$$

A

$(2$ decimals$)$

Per

$\backslash$table$[[$Y$,$Forecast$],[1,100,],[2,110,100],[3,125,110],[4,105,125],[5,110,105],[6,115,110],[7,125,115],[8,,125]]$