Given the following data, what is the weighted moving average forecast with weights of $\mathrm{.}5,\mathrm{.}3,$ and $\mathrm{.}2$ respectively $($WMA $\mathrm{.}5,\mathrm{.}3,\mathrm{.}2)$ for period $5?$

Month Demand

$19$

$220$

$3,18$

$4,19$

$5,17$

$17\mathrm{.}8$

$18\mathrm{.}9$

$18\mathrm{.}8$

no value