MCQ
Write the correct answer in the following: The class marks of a frequency distribution are given as follows: $15, 20, 25, ....$ The class corresponding to the class mark $20$ is:
- A$12.5 - 17.5$
- ✓$17.5 - 22.5$
- C$18.5 - 21.5$
- D$19.5 - 20.5$
✓
Answer
Correct option: B.
$17.5 - 22.5$
The class mark are $15, 20, 25, ….$
The size of each class interval is $25 - 20 = 20 - 15 = 5$
Hence, the class interval corresponding to the class mark $20$ is,
$(20 - 2.5) - (20 + 2.5)$ i.e., $17.5 - 22.5$.
So, $(b)$ is the correct answer.
The size of each class interval is $25 - 20 = 20 - 15 = 5$
Hence, the class interval corresponding to the class mark $20$ is,
$(20 - 2.5) - (20 + 2.5)$ i.e., $17.5 - 22.5$.
So, $(b)$ is the correct answer.
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