1.

100 surnames were randomly picked up from a local telephone directory and the frequency distribution of the number of letters in English alphabets in the surnames was obtained as follows : {:("No of letters",1-4,4-7,7-10,10-13,13-16,16-19),("No of 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.

Answer»


ANSWER :MODE `=7.88`


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