The cumulative frequency table of marks is given. Then, the number of students scoring between 20 and 40 is:
\[
\begin{array}{c|ccccc}
{Marks} & \le 10 & \le 20 & \le 30 & \le 40 & \le 50 \\
\hline
{Frequency} & 5 & 12 & 26 & 37 & 50
\end{array}
\]
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In cumulative frequency, subtract successive values to get class frequency.