$11$

Using a three$-$month moving average, calculate the forecasts for months $4,5,6,7,8,9,10,$ and $11.$

EXPONENTIAL SMOOTHING PROBLEM: If the forecast for June was $111,$ and actual demand was $122,$ what would be the forecast for July if the smoothing constant $()$ is $0\mathrm{.}25?$ If July demand turns out to be $130,$ calculate forecast for August. Use exponential smoothing for your calculation.

Given the following forecast and actual demand, calculate the mean absolute deviation $($MAD$).$

$\backslash$table$[[$PERIOD$,$FORECAST,$\backslash$table$[[$ACTUAL$],[$DEMAND$]],\backslash$table$[[$ABSOLUTE$],[$DEVIATION$],[($ERROR$)]]],[1,100,105,],[2,100,80,],[3,100,110,],[4,100,90,],[5,100,85,],[$TOTAL$,,,]]$

Mean Absolute Deviation $=$