24. What does a MAD represent?

A. Average number of defects

B. Average amount of difference

C. Range of error

D Average error

E Average positive difference

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

PERIOD	FORECAST	ACTUAL
May	410	500
June	460	520
July	510	400
August	615	490
September	650	660
October	685	615

Negative values should be indicated by a minus sign. Round your answers to the nearest whole number.)