Using simple exponential smoothing and the following time series data, respond to each of the items.

Period Demand

$1112$

$2140$

$3151$

$4145$

$5154$

$6158$

$7109$

$8134$

$9124$

$10123$

Required:

An older version of the Microsoft Excel logo$.$ Click here for the Excel Data File

Compute all possible forecasts using a smoothing coefficient $(\backslash$alpha $)$ of $0\mathrm{.}3.$ Compute the MAPE.