Mathematics
If 10, 15, 20, … are respectively the mid-value of the classes of a grouped frequency distribution, then the class whole mid-value is 25 is :
20 - 27
22.5 - 27.5
21.5 - 28.5
21 - 28
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Answer
Difference between the mid values = 15-10 = 5
So, the class width = 5
For the class whose mid-value 25 is
Lower limit = 25 - = 22.5
Upper limit = 25 + = 27.5
So the Class is 22.5 - 27.5.
Hence, option 2 is the correct option.
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