Mathematics · Statistics
100 surnames were randomly selected from a local telephone directory, and the frequency distribution of the number of letters from the English alphabet in the surnames was obtained as follows: Number of letters: 1-4 | 4-7 | 7-10 | 10-13 | 13-16 | 16-19 Number of surnames: 6 | 30 | 40 | 16 | 4 | 4 Find the median number of letters in the surnames.
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