in a school no student has …

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in a school no student has scored less than 25 marks and more than 60 marks in an examination cumulative frequencies are follows less than 60 ,55, 50 ,45 ,40,35,30 total frequencies 121, 115,90,75 ,65,45 32 find the frequencies in the class intervals 25 -30 ,30- 35 -------55 - 60
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