The Local Police, Using Radar, Checked the Speeds (In Mph) $\begin{array} { l l l l l l l l l l } 44 & 38 & 41 & 50 & 36 & 36 & 43 & 42 & 49 & 48 \end{array}$

The local police, using radar, checked the speeds (in mph) of 30 motorists in a construction area. The results arelisted below. Construct a frequency polygon using six classes and a class width of 3. $\begin{array} { l l l l l l l l l l } 44 & 38 & 41 & 50 & 36 & 36 & 43 & 42 & 49 & 48 \end{array}$
$\begin{array} { l l l l l l l l l l } 35 & 40 & 37 & 41 & 43 & 50 & 45 & 45 & 39 & 38 \end{array}$
$\begin{array} { l l l l l l l l l l } 50 & 41 & 47 & 36 & 35 & 40 & 42 & 43 & 48 & 33 \end{array}$