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Question

Ages of 50 people in a village are given in a grouped frequency table given below.

Ages No. of People
1 - 10 10
11 - 20 8
21 - 30 15
31 - 40 8
41 - 50 9

If the age of a person is 30, he should be included in ___________.

A
1st class interval
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B
2nd class interval
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C
In both 1st and 2nd class interval
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D
3rd class interval
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Solution

The correct option is D 3rd class interval
There are 4 classes given in the table:

1st class: 1 - 10
2nd class: 11 - 20
3rd class: 21 - 30
4th class: 31 - 40
5th class: 41 - 50

In this case, the type of class interval is inclusive so lower and upper limit of a class interval belongs to that class interval. In the case of exclusive class interval, the upper limit is not included in the class.

So a person age 30 will belong to the 3rd class interval (21 - 30).

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