Write the correct answer in the following: The class marks of a f… - Vidyadip

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.

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