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Find the mean and variance for each of the data
\begin{tabular}{|c|c|c|c|c|c|c|c|}
\hline \( \mathbf{x}_{\mathrm{i}} \) & \( \mathbf{6} \) & \( \mathbf{1 0} \) & \( \mathbf{1 4} \) & \( \mathbf{1 8} \) & \( \mathbf{2 4} \) & \( \mathbf{2 8} \) & \( \mathbf{3 0} \) \\
\hline \( \mathbf{f}_{\mathrm{i}} \) & \( \mathbf{2} \) & \( \mathbf{4} \) & \( \mathbf{7} \) & \( \mathbf{1 2} \) & \( \mathbf{8} \) & \( \mathbf{4} \) & \( \mathbf{3} \)
\end{tabular}
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