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प्रश्न
Find the class-mark of the class 35 - 40.
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उत्तर
Class mark = `("Lower class limit" + "Upper class limit")/2`
Since, `(35 + 40)/2`
= `75/2`
= 37.5
So, the class mark for the class 35 - 40 is 37.5.
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