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

$\backslash$table$[[$Year$,1,2,3,4,5,6,7,8,9,10,11],[$Demand$,7,10,5,9,12,9,12,13,8,13,7]]$

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$).$

$\backslash$table$[[$Year$,4,5,6,7,8,9,10,11,12],[$Forecast$,7\mathrm{.}3,8\mathrm{.}0,8\mathrm{.}7,10\mathrm{.}0,11\mathrm{.}0,11\mathrm{.}3,11\mathrm{.}0,11\mathrm{.}3,9\mathrm{.}3]]$

c$)$ Using the $3-$year weighted moving average with weights $0\mathrm{.}15,0\mathrm{.}25,$ and $0\mathrm{.}60,$ using $0\mathrm{.}60$ for the most recent period, provide the forecast from periods $4$ through $12($round your responses to two decimal places$).$

$\backslash$table$[[$Year$,4,5,6,7,8,9,10,11,12],[$Forecast$,,,,,,,,,$