100 surnames were randomly picked up from a local telephone directory and the frequency distribu...

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100 surnames were randomly picked up from a local telephone directory and the frequency distribution of the number of letters in the English alphabets in the surnames
P was obtained as follows:

WV
\begin{tabular}{|l|c|c|c|c|c|c|}
\hline Number of letters & \( 1-4 \) & \( 4-7 \) & \( 7-10 \) & \( 10-13 \) & \( 13-16 \) & \( 16-19 \) \\
\hline Number of surnames & 6 & 30 & 40 & 16 & 4 & 4 \\
\hline
\end{tabular}
Determine the median number of letters in the surnames. Find the mean number of letters in the surnames? Also, find the modal size of the surnames.
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