Find the coefficient of variation for the following data : \begin{tabular}{|l|c|c|c|c|c|c|c|c|} ...

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Find the coefficient of variation for the following data :
\begin{tabular}{|l|c|c|c|c|c|c|c|c|}
\hline Marks & \( 20-29 \) & \( 30-39 \) & \( 40-49 \) & \( 50-59 \) & \( 60-69 \) & \( 70-79 \) & \( 80-89 \) & \( 90-99 \) \\
\hline Number of students & 5 & 12 & 15 & 20 & 18 & 10 & 6 & 4 \\
\hline
\end{tabular}
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