My score: $64\mathrm{.}74/80$ pts $(80\mathrm{.}92\%)$

The following table shows the actual demand observed over the last $11$ years:

This exercise contains only parts b$,$ c$,$ and d$.$

b$)$ Using the $3-$year moving average, provide the forecast from periods $4$ through $12($round your responses to

one decimal place$).$

c$)$ Using the $3-$year weighted moving average with weights $0\mathrm{.}20,0\mathrm{.}25,$ and $0\mathrm{.}55,$ using $0\mathrm{.}55$ for the most

recent period, provide the forecast from periods $4$ through $12($round your responses to two decimal places$).$