| Class | $0 - 4$ | $4 - 8$ | $8 - 12$ | $12 - 16$ | $16 - 20$ |
| Frequency | 3 | 9 | 10 | 8 | 6 |
Let $M$ denote the median of the following frequency distribution.
\begin{center}
\begin{tabular}{ | l | l | l | l | l | l | }
\hline
Class & $0 - 4$ & $4 - 8$ & $8 - 12$ & $12 - 16$ & $16 - 20$ \\
\hline
Frequency & 3 & 9 & 10 & 8 & 6 \\
\hline
\end{tabular}
\end{center}
Then 20 M is equal to :\\
(1) 416\\
(2) 104\\
(3) 52\\
(4) 208