Find the variance and SD for the given frequency distribution.
\begin{tabular}{|cc|}
\hline Clas...
Find the variance and SD for the given frequency distribution.
\begin{tabular}{|cc|}
\hline Class Interval & Frequency \\
\hline \( 1-5 \) & 4 \\
\( 6-10 \) & 1 \\
\( 11-15 \) & 2 \\
\( 16-20 \) & 3 \\
\hline
\end{tabular}
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