Class mark of a particular class is 9.5 and the class size is 6, then the class interval is

3.5 - 15.5

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12.5 - 18.5

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6.5 - 12.5

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15.5 - 27.5

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Solution

The correct option is C 6.5 - 12.5
$C l a s s m a r k = 9.5 U p p e r l i m i t o f c l a s s = C l a s s m a r k + \frac{c l a s s s i z e}{2} = 9.5 + 3 = 12.5 L o w e r l i m i t o f c l a s s = C l a s s m a r k - \frac{c l a s s s i z e}{2} = 9.5 - 3 = 6.5$
Hence, the class interval is 6.5-12.5.

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