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:

a$.$ Compute an exponentially smoothed

forecast, using an $$ value of $\mathrm{.}30.$

b$.$ Compute an adjusted exponentially

smoothed forecast

$($with $=\mathrm{.}30$ and $=\mathrm{.}20).$

c$.$ Compare the two forecasts by

using MAPD, and indicate which seems

to be more accurate.