Marks scored by 400 students in an examination are as follows: \begin{tabular}{|c|c|c|c|c|c|c|c|...

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Marks scored by 400 students in an examination are as follows:
\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|}
\hline Marks & \( 0-10 \) & \( 10-20 \) & \( 20-30 \) & \( 30-40 \) & \( 40-50 \) & \( 50-60 \) & \( 60-70 \) & \( 70-80 \) & \( 80-90 \) & \( 90-100 \) \\
\hline No. of students & 10 & 20 & 22 & 40 & 55 & 75 & 80 & 58 & 28 & 12 \\
\hline
\end{tabular}
Draw the ogive and from it determine:
the pass marks if \( 80 \% \) of the students pass examination.
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