exponential smoothing to forecast weekly sales of cement $($in tons$)$ in a cement production ry based on the data given in Tableau above. $($Take F$2=$D$1)($Set $=0\mathrm{.}5)(20$ points.$)$

is Cumulative Forecast Error? $(5$ Points$)$

s the average value of forecast error? $(\frac{?}{\text{b}\text{a}\text{r}}(E))(5$ Points$)$

Mean Absolute Deviation $($MAD$)$ value? $(5$ points$)$

$g$ forecast errors are normally distributed with a mean of $0$ calculate the $$ value based on the hip between $$ and MAD. $(5$ points$)$