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Fir \( d \) the mean of the following frequency distribution:
\begin{tabular}{|l|l|l|l|l|l|l|l|l|l|l|}
\hline Marks & \( \begin{array}{l}\text { Below } \\
10\end{array} \) & \( \begin{array}{l}\text { Below } \\
20\end{array} \) & \( \begin{array}{l}\text { Below } \\
30\end{array} \) & \( \begin{array}{l}\text { Below } \\
40\end{array} \) & \( \begin{array}{l}\text { Below } \\
50\end{array} \) & \( \begin{array}{l}\text { Below } \\
60\end{array} \) & \( \begin{array}{l}\text { Below } \\
70\end{array} \) & \( \begin{array}{l}\text { Below } \\
80\end{array} \) & \( \begin{array}{l}\text { Below } \\
90\end{array} \) & \( \begin{array}{l}\text { Below } \\
100\end{array} \) \\
\hline \( \begin{array}{l}\text { Number } \\
\text { of } \\
\text { students }\end{array} \) & 12 & 22 & 35 & 50 & 70 & 86 & 97 & 104 & 109 & 115 \\
\hline
\end{tabular}
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