Amanufacturing company has monthly demand for one of its products as follows month demand feb 520 mar 490 apr 550 may 580 june 600 july 420 august 510 sep 610 a) develop a three-period moving average forecast and a three period weighted moving average forecast with weights of 0.50, 0.30, and 0.20 for the most recent demand values, in that order. (15 points) b) calculate mad for each forecast, and indicate which would seem to be most accurate. (10 points)