#$4$

Using the data below, what is the $2$ period moving average forecast for the $3$rd week?

$\backslash$table$[[$Week$,$Actuals$/$Time Series Value$],[1,18\mathrm{.}00],[2,9\mathrm{.}00],[3,18\mathrm{.}00],[4,13\mathrm{.}00]]$

Answer format: Number: Round to: $1$ decimal places.