Find the standard deviation for the following frequency distribution : \begin{tabular}{|c|c|c|c|...

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Find the standard deviation for the following frequency distribution :
\begin{tabular}{|c|c|c|c|c|c|c|}
\hline\( x \) & 2 & 3 & 4 & 5 & 6 & 7 \\
\hline\( f \) & 4 & 9 & 16 & 14 & 11 & 6 \\
\hline
\end{tabular}
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