Find median, lower quartile and upper quartile for the following data sets :
\begin{tabular}{|l|...
Find median, lower quartile and upper quartile for the following data sets :
\begin{tabular}{|l|c|c|c|c|c|c|c|}
\hline Variate & 15 & 18 & 20 & 22 & 25 & 27 & 30 \\
\hline Frequency & 4 & 6 & 8 & 9 & 7 & 8 & 6 \\
\hline
\end{tabular}
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