Find the values of \( a \) and \( b \) from the following data : \begin{tabular}{|l|c|c|c|c|c|c|...

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Find the values of \( a \) and \( b \) from the following data :
\begin{tabular}{|l|c|c|c|c|c|c|}
\hline Variable & \( 10-20 \) & \( 20-30 \) & \( 30-40 \) & \( 40-50 \) & \( 50-60 \) & \( 60-70 \) \\
\hline Frequency & 4 & 28 & \( a \) & 20 & \( b \) & 16 \\
\hline
\end{tabular}
Given that median is \( 41.5 \) and total frequency is 100 .
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