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

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Find the coefficient of variation for following data :
\begin{tabular}{|l|c|c|c|c|c|c|}
\hline Size (in cm) & \( 10-15 \) & \( 15-20 \) & \( 20-25 \) & \( 25-30 \) & \( 30-35 \) & \( 35-40 \) \\
\hline No. of items & 2 & 8 & 20 & 35 & 20 & 15 \\
\hline
\end{tabular}
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