Calculate cumulative frequency for group 7, class 4--6.
\( \begin{array}{l} \text{The table shows books read by students in group 7:} \\ \begin{array}{|c|c|} \hline \text{Books Read} & \text{Frequency} \\ \hline 0--2 & 4 \\ 2--4 & 6 \\ 4--6 & 3 \\ 6--8 & 2 \\ \hline \end{array} \\ \text{What is the cumulative frequency for class 4--6?} \end{array} \)
Choose one option:
Verify each addition to ensure 13 is correct.
Sum all frequencies including the 4--6 class to get cumulative frequency.
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