case $2($continued$)$

Compute a weighted three$-$month average forecast for the next month $($September$).$ Assign weights of $\mathrm{.}55,\mathrm{.}33,$ and $\mathrm{.}12$ to the months in sequence, starting with the most recent month.

$151\mathrm{.}7$

$151\mathrm{.}6$

$143$

$159\mathrm{.}15$