\( \text{Estimate the mean from this grouped data:}\newline\begin{array}{|c|c|}\hline\text{Class} & \text{Frequency} \\ \hline 0 - 10 & 3 \\ 10 - 20 & 5 \\ 20 - 30 & 7 \\ 30 - 40 & 5 \\ \hline\end{array} \)
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