Find the mean deviation about median for the following data : \(\begin{tabular}{|c|c| \hline Mar...

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Find the mean deviation about median for the following data :
\(\begin{tabular}{|c|c|
\hline Marks & Number of girls \\
\hline \( 0-10 \) & 6 \\
\hline \( 10-20 \) & 8 \\
\hline \( 20-30 \) & 14 \\
\hline \( 30-40 \) & 16 \\
\hline \( 40-50 \) & 4 \\
\hline \( 50-60 \) & 2 \\
\hline \end{tabular})\
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