Find the Class Marks of 60–80 , 100–120.
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Step-by-step explanation:
60-80 = 60 +80 =140÷2 = 70 .
100-120= 100+120= 220÷2 = 110 .
so , classmark of 60-80 = 70.
classmark of 100-120 = 110.
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