A group frequency distribution table is given below with class mark and frequencies. find class intervals. class marks - 7 , 15 , 23 , 31 , 39 47 frequency - 6 , 11 , 19 , 21 , 12 , 6.
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find class intervals. class marks - 7 , 15 , 23 , 31 , 39 , 47 frequency - 6 , 11 , 19 , 21 , 12 , 6...............,....................
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