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प्रश्न
Find the class marks of classes 10 -25 and 35 – 55.
उत्तर
Class mark =`("Upper Limit+Lower limit")/2`
∴ class mark of 10-25 =`(10+25)/2`
= 17.5
And class mark of 35-55=`(35+55)/2`
=45
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