Question

Calculate Arithmetic mean and standard deviation. \begin{tabular}{|c|c|} \hline\( C-1 \) & \( f \) \\ \hline \( 21-76 \) & 2 \\ \hline \( 77-132 \) & 1 \\ \hline \( 133-188 \) & 3 \\ \hline \( 189-244 \) & 18 \\ \hline \( 245-300 \) & 11 \\ \hline \( 301-356 \) & 8 \\ \hline \( 357-412 \) & 5 \\ \hline \( 413-468 \) & 1 \\ \hline \end{tabular}

          Calculate Arithmetic mean and standard deviation.
\begin{tabular}{|c|c|}
\hline\( C-1 \) & \( f \) \\
\hline \( 21-76 \) & 2 \\
\hline \( 77-132 \) & 1 \\
\hline \( 133-188 \) & 3 \\
\hline \( 189-244 \) & 18 \\
\hline \( 245-300 \) & 11 \\
\hline \( 301-356 \) & 8 \\
\hline \( 357-412 \) & 5 \\
\hline \( 413-468 \) & 1 \\
\hline
\end{tabular}