Petroco Service Station: Exponentially smoothed forecast & MAPD

The manager of the Petroco Service Station wants to forecast the demand for unleaded gasoline next month so that the proper number of gallons can be ordered from the distributor. The owner has accumulated the following data on demand for unleaded gasoline from sales during the past 10 months:

Month Gasoline Demanded (gal.)
October 800
November 725
December 600
January 500
February 625
March 690
April 810
May 935
June 1,200
July 1,100

a. Compute an exponentially smoothed forecast, using an α value of 0.30.
b. Compute the MAPD.

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