The upper limit of a class interval is 2a and lower limit of the class interval is a. The ratio of class size and mid value will be

1 : 4

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2 : 3

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2 : 3

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1 : 2

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Solution

The correct option is C $2 : 3$
Given that
Upper limit of the Class interval = 2a
Lower limit of the Class interval = a
We know that,
Class size = Upper limit of class interval - Lower limit of class interval.
= 2a - a
Class size = a
Mid value = $\frac{2 a + a}{2} = \frac{3 a}{2}$
Ratio of class size and mid value $a : \frac{3 a}{2} = 2 : 3$
Hence, option D is the correct answer.

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