A particular forecasting model was used to forecast a six$-$month period. Here are the forecasts and actual demands that resulted:

FORECAST ACTUAL

April $258208$

May $334244$

June $409329$

July $359308$

August $384328$

September $459403$

a$.$ Find the tracking signal for each month. $($Negative values should be indicated by a minus sign. Round your answers to the nearest whole number.$)$

b$.$ Does the model used here give acceptable answers?

multiple choice

No$,$ the model's performance is poor.

Yes, the model's performance is good.