Find the mean and variance of the following data by using step deviation method:
\begin{tabular}...
Find the mean and variance of the following data by using step deviation method:
\begin{tabular}{|l|c|c|c|c|c|c|c|c|c|}
\hline Classes & \( 0-5 \) & \( 5-10 \) & \( 10-15 \) & \( 15-20 \) & \( 20-25 \) & \( 25-30 \) & \( 30-35 \) & \( 35-40 \) & \( 40-45 \) \\
\hline Frequency & 20 & 24 & 32 & 28 & 20 & 11 & 26 & 15 & 24 \\
\hline
\end{tabular}
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