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Question
The class marks of a frequency distribution are 5, 10, 15, 20, 25, 30. The class corresponding to class mark 20 is ______.
Options
17.5 – 22.5
17 – 23
15 – 25
none of these
MCQ
Fill in the Blanks
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Solution
The class marks of a frequency distribution are 5, 10, 15, 20, 25, 30. The class corresponding to class mark 20 is 17.5 – 22.5.
Explanation:
The class-size = difference between successive class marks
= 10 – 5
= 5
Half the class-size = 2.5.
So the class with midpoint 20 is 20 – 2.5 to 20 + 2.5 = 17.5 – 22.5.
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