Problem $3-22($Static$)$

Your manager is trying to determine what forecasting method to use. Based on the following historical data, calculate the following forecast and specify what procedure you would utilize.

$$

MONTHACTUAL DEMAND$162265367468571673776878978108011841285$

b$.$ Calculate the weighted three$-$month moving average for the periods $4-12$using weights of $0\mathrm{.}50($for the period t$1)$; $0\mathrm{.}30($for the period t$2)$ and $0\mathrm{.}20($for the period t$3).($Round your answers to $1$ decimal place.$)$

$$