The mid-values of the continuous class intervals of equal length of a distribution are 25, 34, 43, 52, 61, Then the first class interval of the distribution is :

The correct answer is (a).

The mid-values of the continuous class intervals of equal length of a distribution are 25, 34, 43, 52, 61. This means that the class intervals are 24.5 – 34.5, 34.5 – 44.5, 44.5 – 54.5, 54.5 – 64.5, and 64.5 – 74.5. The first class interval is 24.5 – 34.5.

Option (b) is incorrect because it does not include the lower limit

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