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The class marks of a frequency distribution are given as follows 15,20, 25,……….. The class corresponding to the class mark 20 isA. 12.5-17.5B. 17.5-22.5C. 18.5-21.5D. 19.5-20.5 |
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Answer» Correct Answer - B Class size=(20-15)=5 Class mark=20. Lower limit=`(20-(5)/(2))=(35)/(2)=17.5` Upper limit=`(20+(5)/(2))=(45)/(2)=22.5` Required class is 17.5-22.5 |
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