Find the mean, variance and standard deviation for the following data by using short cut method:...

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Find the mean, variance and standard deviation for the following data by using short cut method:
\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|}
\hline\( x_{i} \) & 60 & 61 & 62 & 63 & 64 & 65 & 66 & 67 & 68 \\
\hline\( f_{i} \) & 2 & 1 & 12 & 29 & 25 & 12 & 10 & 4 & 5 \\
\hline
\end{tabular}
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