The following distribution gives the state-wise teacher-student ratio in higher secondary schools of India. Find the mode and mean of this data. Interpret the two measures. \begin{array}{|c|c|} \hline \text{Number of students per teacher} & \text{Number of states / U.T.} \\ \hline 15 - 20 & 3 \\ 20 - 25 & 8 \\ 25 - 30 & 9 \\ 30 - 35 & 10 \\ 35 - 40 & 3 \\ 40 - 45 & 0 \\ 45 - 50 & 0 \\ 50 - 55 & 2 \\ \hline \end{array}