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Problem $3-21($Algo$)$

The following table shows predicted product demand using your particular forecasting method along with the actual demand that occurred:

FORECAST ACTUAL

$1,4851,540$

$1,3851,490$

$1,6851,590$

$1,7151,636$

$1,7851,735$

Compute the tracking signal using the mean absolute deviation and running sum of forecast errors.

Note: Negative values should be indicated by a minus sign. Round your "Mean Absolute Deviation", "Tracking Signal" to $2$ decimal places and all other answers to the nearest whole number.