Calculate the mean, variance and standard deviation for the following frequency distribution by ...
Calculate the mean, variance and standard deviation for the following frequency distribution by using step deviation method :
\begin{tabular}{|l|c|c|c|c|c|c|c|}
\hline Classes & \( 30-40 \) & \( 40-50 \) & \( 50-60 \) & \( 60-70 \) & \( 70-80 \) & \( 80-90 \) & \( 90-100 \) \\
\hline Frequency & 3 & 7 & 12 & 15 & 8 & 3 & 2 \\
\hline
\end{tabular}
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