Problem $3-23($Algo$)$

After using your forecasting model for six months, you decide to test it using a tracking signal. Here are the forecast and actual demands for the six$-$month period:

$\backslash$table$[[$PERIOD$,$FORECAST,ACTUAL$],[$May$,445,500],[$June$,495,530],[$July$,545,400],[$August$,610,470],[$September$,660,685],[$October$,690,625]]$

Find the tracking signal.

Note: Negatlve velues should be Indleated by a minus sign. Round your answers to $2$ decimal places.

$\backslash$table$[[$Period$,$Tracking Signal$],[$May$,],[$June$,],[$July$,],[$August$,],[$September$,],[$October$,]]$