Find the mean and variance for the following frequency distribution...

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Find the mean and variance for the following frequency distributions
\( \mathrm{P} \)
\begin{tabular}{|c|c|c|c|c|c|c|c|}
\hline Classes & \( 0-30 \) & \( 30-60 \) & \( 60-90 \) & \( 90-120 \) & \( 120-150 \) & \( 150-180 \) & \( 180-210 \) \\
\hline Frequencies & 2 & 3 & 5 & 10 & 3 & 5 & 2 \\
\hline
\end{tabular}
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