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प्रश्न
Find the class mark of the classes 20-30 and 30-40.
उत्तर
`"Class mark" = ("Upper limit"+"Lower limit")/2`
∴`"Class mark of the class" 20-30 =(30+20)/2=50/2=25`
`"Class Mark of the class"30-40=(40+30)/2=70/2=35`
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