In the following distribution, what is the modal class?
| Class | Frequency |
|---|---|
| 0-10 | 15 |
| 10-20 | 20 |
| 20-30 | 45 |
| 30-40 | 15 |
| 40-50 | 25 |
Find the mean of the following distribution:
\[\begin{array}{|c|c|c|c|c|c|c|c|} \hline \textbf{Class-interval} & 11-13 & 13-15 & 15-17 & 17-19 & 19-21 & 21-23 & 23-25 \\ \hline \text{Frequency} & \text{7} & \text{6} & \text{9} & \text{13} & \text{20} & \text{5} & \text{4} \\ \hline \end{array}\]