Q$1($Forecasting$).$ Given the following original forecast and actual data:

$\backslash$table$[[$Month$,$Forecast,Actual,Trend$],[$Jan$,500,605,50],[$Feb$,594,550,20],[$Mar$,-,552,],[$Apr$,-,573,],[$May$,-,650,],[$Jun$,-,660,],[$Jul$,-,682,],[$Aug$,-,675,],[$Sep$,-,654,],[$Oct$,-,689,],[$Nov$,-,???,]]$

part A Use a $2$ month weighted moving average with weights for periodst $=60\%,t-1=40\%,$ to make a forecast for each month through November. What is the error $($Actual minus Forecast$)$ each month through October?