3. Consider the aata: \( 56,6 /, 54,34,18,43,23 \). What is the median? If the mean of the following data is 20.6 , find the missing frequency ( \( p \)
\begin{tabular}{|c|c|c|c|c|c|}
\hline\( x \) & 10 & 15 & 20 & 25 & 35 \\
\hline\( f \) & 3 & 10 & \( P \) & 7 & 5 \\
\hline
\end{tabular}