John rents a tractor to contractors and walk$-$in customers. He has prepared a forecast for weeks $4$ through $6.$ The actual demands of the tractor and the forecasts made for each of the last $3$ weeks are shown in the table below. Round to four decimal places. $[$Note: Forecast error $[(|)/(D|))/(n\}$

Week Demand Forecast

$\backslash$table$[[4,24,33],[5,21,20],[6,18,21]]$

What is the absolute forecast error for week $4?$

What is the value of MAD and MSE?

What is the squared error for week five?What is the absolute percent error four week six?