If the class mark of a class interval is 25, then the sum of its lower and upper class limits is

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Solution

The correct option is C
50

Class mark = $\frac{l o w e r c l a s s l i m i t + u p p e r c l a s s l i m i t}{2}$

$⟹$ Class mark $\times$ 2 = lower class limit + upper class limit

$⟹$ lower class limit + upper class limit = 25 $\times$ 2 = 50

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