Estimate the median class from a grouped frequency table.
\( \begin{array}{l} \text{Estimate the median class:} \\ \begin{array}{|c|c|} \hline \text{Time (minutes)} & \text{Frequency} \\ \hline 0--10 & 5 \\ 10--20 & 10 \\ 20--30 & 5 \\ \hline \end{array} \end{array} \)
Choose one option:
Sum frequencies sequentially until reaching half the total.
Use cumulative frequency to determine which class contains the median.
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