1. Historical demand for a product is

Month	Demand
January	12
February	11
March	15
April	12
May	16
June	15

(a) Using a weighted moving average with weights of 0.60 for June, 0.30 for May, and 0.10 for April, find the July forecast.

(b) Using a simple three-month moving average, find the July forecast.

(c) Using exponential smoothing with a = 0.2 and a June forecast of 13, find the July forecast.