Find the mean, variance and standard deviation for the following data by using step deviation me...
Find the mean, variance and standard deviation for the following data by using step deviation method:
\begin{tabular}{|l|c|c|c|c|c|c|c|c|c|}
\hline Classes & \( 10-20 \) & \( 20-30 \) & \( 30-40 \) & \( 40-50 \) & \( 50-60 \) & \( 60-70 \) & \( 70-80 \) & \( 80-90 \) & \( 90-100 \) \\
\hline Frequency & 3 & 4 & 7 & 7 & 15 & 9 & 6 & 6 & 3 \\
\hline
\end{tabular}
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