4. The marks distribution of 30 students in a science examination are as follows. Find the mode of this data.
[2 Marks]
\begin{tabular}{|l|c|c|c|c|c|c|c|c|c|c|c|c|c|}
\hline Marks obtained \( \left(x_{1}\right) \) & 10 & 20 & 36 & 40 & 50 & 56 & 60 & 70 & 72 & 80 & 88 & 92 & 95 \\
\hline Number of students \( \left(f_{i}\right. \) & 1 & 1 & 3 & 4 & 3 & 2 & 4 & 4 & 1 & 1 & 2 & 3 & 1 \\
\hline
\end{tabular}
