Your manager is trying to determine what forecasting method to use. Based upon the following historical data, calculate the

following forecast and specify what procedure you would utilize. Calculate the weighted three$-$month moving average for period $10$

using weights of $0\mathrm{.}40($for the period t$1)$; $0\mathrm{.}30($for the period t$2),$ and $0\mathrm{.}30($for the period t$3)$