A particular forecasting model was used to forecast a six

$-$

month period. Here are the forecasts and actual demands that resulted:

Month

Forecast

Actual

April

$2$

$6$

$0$

$2$

$1$

$0$

May

$3$

$3$

$5$

$2$

$6$

$0$

June

$4$

$1$

$0$

$3$

$3$

$2$

July

$3$

$6$

$0$

$3$

$1$

$0$

August

$3$

$8$

$5$

$3$

$3$

$5$

September

$4$

$6$

$0$

$4$

$0$

$3$