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Please help... b & c can be done with the attached template, but I do not know how to implement the data...

Historical demand for a product is:
Jan 12
Feb 11
March 15
APril 12
May 16
June 15

a. using weighted moving average with weights of .60, .30 and .10. What is July forecast?
b. Using a simple three month moving average, find July forecast?
c. Using single exponential smoothing with alpha= 0.2 and a June forecast = 13, find the July forecast. Make whatever assumptions you wish.