Time Period Actual Series Forecast Series Forecast Error

$11001000$

$2110$

$3115$

If a three$-$month moving$-$average model is used, what is the forecast for period $4?$

Multiple Choice

$107\mathrm{.}1.$

$106\mathrm{.}6.$

$110\mathrm{.}2.$

$108\mathrm{.}3.$

$104\mathrm{.}4.$