1.

The class marks of a frequency distribution are given as follows 15,20, 25,……….. The class corresponding to the class mark 20 isA. `12.5-17.5`B. `17.5-22.5`C. `18.5-21.5`D. `19.5-20.5`

Answer» Correct Answer - B
Since, the difference between mid values is 5. So, the corresponding class to the class mark 20 must have difference 5. Therefore, option ( c) and (d) are wrong.
Since, the mid values is 20 which can get only, if we take option (b)
`(17.5 + 22.5)/2=40/2=20`


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