What is the class-mark of class 25-30?

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Solution

Class is 25-30
Class mark is given by
Class mark $= \frac{Lower limit + Upper limit}{2}$
Class mark $= \frac{25 + 30}{2} = \frac{55}{2}$
Class mark $= 27.5$

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The class mark of class interval 25-30 is ______

\begin{matrix} C o l u m n - I & C o l u m n - I I (A) T h e c l a s s m a r k o f t h e c l a s s i n t e r v a l & (p) 13 145 - 150 i s (B) I n a f r e q u e n c y d i s t r i b u t i o n, t h e m i d - v a l u e o f a & (q) 110 c l a s s i s 10 a n d w i d t h o f e a c h c l a s s i s 6. T h e u p p e r l i m i t o f t h e c l a s s i s (C) T h e m e a n o f e i g h t n u m b e r s i s 40. I f o n e & (r) 22.5 - 27.5 n u m b e r i s e x c l u d e d, t h e i r m e a n b e c o m e s 30. T h e e x c l u d e d n u m b e r i s (D) T h e c l a s s m a r k s o f a f r e q u e n c y d i s t r i b u t i o n a r e & (s) 147.5 15, 20, 25, 30, \dots \dots T h e c l a s s c o r r e s p o n d i n g t o t h e c l a s s m a r k 25 i s \end{matrix}

Class mark of a class interval 30-38 is

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