Estimate the mean from a grouped frequency table.
\( \begin{array}{l} \text{Estimate the mean from the grouped frequency table:} \\ \begin{array}{|c|c|} \hline \text{Score} & \text{Frequency} \\ \hline 0--10 & 4 \\ 10--20 & 6 \\ 20--30 & 10 \\ \hline \end{array} \end{array} \)
Choose one option:
Check all multiplications and summing carefully before dividing.
Multiply each midpoint by frequency, sum, divide by total frequency.
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