Using the data below, what is the weighted moving average forecast for the $4$ th week?

The weights are $20,30,50($oldest period to most recent period$)$

Week

$1$

$2$

$3$

$4$

Time Series Value

$7\mathrm{.}00$

$13\mathrm{.}00$

$19\mathrm{.}00$

$19\mathrm{.}00$

Submit