Find the mean deviation about the mean for the following data : \begin{tabular}{|l|c|c|c|c|c|c|c...

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Find the mean deviation about the mean for the following data :
\begin{tabular}{|l|c|c|c|c|c|c|c|}
\hline Marks obtained & \( 10-20 \) & \( 20-30 \) & \( 30-40 \) & \( 40-50 \) & \( 50-60 \) & \( 60-70 \) & \( 70-80 \) \\
\hline Number of students & 2 & 3 & 8 & 14 & 8 & 3 & 2 \\
\hline
\end{tabular}
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