Last Year, a Road Construction Firm Hired 11 New Employees $\begin{array} { l l l l } 23 & 19 & 30 & 33 \end{array}$

Last year, a road construction firm hired 11 new employees. Their ages at hiring are listed below. Find the mean hiring age to one decimal place. $\begin{array} { l l l l } 23 & 19 & 30 & 33 \end{array}$
$\begin{array} { l l l l } 27 & 31 & 58 & 22 \end{array}$
$\begin{array} { l l l } 21 & 26 & 29 \end{array}$