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100 surnames were randomly picked up fro...

100 surnames were randomly picked up from a local telephone directly and the frequency distribution of the number of letters in the English alphabets in the surnames was obtained as follows: Number of letters: 1-4 4-7 7-10 10-13 13-16 16-19 Number surnames 6 30 40 16 4 4 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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The correct Answer is:
Mean =8.32, median = 8.05, mode = 7.51
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