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The class marks of a frequency distribution are 10, 20, 30... The class corresponding to the class mark 30 is _____.

A. 20-40
B. 30-40
C. 25-30
D. 25-35

Answer :

Final answer:

For a class mark of a frequency distribution are 10,20,30....the class corresponding to the class mark 30 in a series that goes up by tens (like 10, 20, 30), the likely corresponding class interval would be five less and five more than the class mark, thus it results in '25-35'.

Explanation:

In statistics, the class mark of a frequency distribution is the midpoint of each interval or class. It is obtained by taking the average of the lower and upper limits of the class. In this case, where the class marks are provided as 10, 20, 30, and so on, it is assumed that these are evenly spaced.

This could likely hint towards class lengths of 10 unit each. Given this assumption, for a class mark of 30, the lower limit would be 5 units less (30 - 5 = 25) and the upper limit would be 5 units more (30 + 5 = 35). So, the class interval or range corresponding to the class mark 30 would indeed be 25 - 35. Therefore, the correct option is d. 25-35.

Learn more about the topic of Frequency Distribution here: brainly.com/question/28406412

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