Find the class marks of classes 15.5-18.5 and 50-75
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the class mark of class 15.5-18.5 is 17 and the class Mark of class 50-75 is 62.5
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the class mark of class 15.5 -
18.5 is 15.5+18.5/2=17and and class mark of class 50-75is 50+75/2=62.5
18.5 is 15.5+18.5/2=17and and class mark of class 50-75is 50+75/2=62.5
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