6. The class marks of a frequency distribution are given as follows : 15

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6. The class marks of a frequency distribution are given as follows : 15, 20, 25, … The class corresponding to the class mark 20 is :
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6. The class marks of a frequency distribution are given as follows : 15, 20, 25, … The class corresponding to the class mark 20 is : ... The class corresponding to the class mark 20 is : 20 25 6. The class marks of a frequency distribution are given as follows : 15 July [...]
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