Your company has the following demand data for the past $12$ months.

Month Demand $($$$)$

$117000$

$223000$

$321000$

$417500$

$532000$

$635500$

$734000$

$831000$

$939500$

$1058000$

$1144000$

$1245500$ Calculate the mean forecast error $($bias$)$ for months $7-12$ of a weighted average

forecast with prior months weighted $\mathrm{.}45,\mathrm{.}35$ and $\mathrm{.}2$ respectively. What does the

error tell you about this forecast?