The following are monthly actual and forecast demand levels for May through December for units of a product manufactured by the Deborah Bishop Company in Des Moines:

$\backslash$table$[[$Month$,$Actual Demand,Forecast Demand$],[$May$,100,100],[$June$,80,104],[$July$,110,99],[$August$,115,101],[$September$,105,104],[$October$,110,104],[$November$,125,105],[$December$,120,109]]$

For the given forecast, the tracking signal $=3\mathrm{.}58$ MADs $($round your response to two decimal places$).$

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