Find the mean and standard deviation for the following data : \begin{tabular}{|c|c|c|c|c|c|c|c|}...

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Find the mean and standard deviation for the following data :
\begin{tabular}{|c|c|c|c|c|c|c|c|}
\hline\( x_{i} \) & 6 & 10 & 14 & 18 & 24 & 28 & 30 \\
\hline\( f_{i} \) & 2 & 4 & 7 & 12 & 8 & 4 & 3 \\
\hline
\end{tabular}
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