Consider the following moving average model.

MA n$=2$

Period

Demand

Forecast

Error

ABS$($Error$)$

$1$

$19$

$2$

$21$

$3$

$28$

$20\mathrm{.}00$

$8$

$8\mathrm{.}00$

$4$

$25$

$24\mathrm{.}50$

$0\mathrm{.}50$

$0\mathrm{.}50$

$5$

$30$

$26\mathrm{.}50$

$3\mathrm{.}50$

$3\mathrm{.}50$

$6$

$33$

$27\mathrm{.}50$

$5\mathrm{.}50$

$5\mathrm{.}50$What is the forecast for period $10?$