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

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Find the mean and the standard deviation for the following data:
\begin{tabular}{|c|c|c|c|c|c|c|}
\hline No. of children & \( 0-2 \) & \( 2-4 \) & \( 4-6 \) & \( 6-8 \) & \( 8-10 \) & \( 10-12 \) \\
\hline No. of families & 272 & 328 & 205 & 120 & 15 & 10 \\
\hline
\end{tabular}
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