Using the $4$ weeks of data bellow, Rorecast salles for the Arth week using a $3$ week weighted mowing average. The most current welight is $0\mathrm{.}6,$ then $0\mathrm{.}3$ and lastly $0\mathrm{.}1.$

$\backslash$table$[[$Week$,$Sales$],[2,30],[2,40],[3,50],[4,40]]$

$43$

$34$

$25$

$31$

$24$