The follcwing frequency distribution shows the marks obtained by 80 students in an examination. ...
The follcwing frequency distribution shows the marks obtained by 80 students in an examination. Find the mean marks obtained by students.
\begin{tabular}{|c|c|}
\hline Marks & No. of Students \\
\hline Above 0 & 80 \\
\hline Above 10 & 77 \\
\hline Above 20 & 72 \\
\hline Above 30 & 65 \\
\hline Above 40 & 55 \\
\hline Above 50 & 43 \\
\hline Above 60 & 23 \\
\hline Above 70 & 16 \\
\hline Above 80 & 10 \\
\hline Above 90 & 8 \\
\hline Above 100 & \( \mathbf{0} \) \\
\hline
\end{tabular}
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