For the Following Problems, Consider This Frequency Table of Survey

Short Answer

For the following problems, consider this frequency table of survey data:
$\begin{array}{|l|l|l|l|}\hline & F & \text { rel. } f & \text { cum. } f \\\hline \mathbf{1} & 2 & 0.15 & 0.15 \\\hline \mathbf{2} & 3 & 0.23 & 0.38 \\\hline \mathbf{3} & 3 & 0.31 & 0.69 \\\hline \mathbf{4} & 4 & 0.23 & 0.92 \\\hline \mathbf{5} & 1 & 0.08 & 1.00 \\\hline\end{array}$
-What is the standard deviation of the sample described by this frequency table?