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Question

Marks of 30 students in mathematics test are given in the adjacent grouped frequency distribution.
Sl. NoMarksNo of students
1055
25107
3101510
415206
520252
What are the individual marks of 2 students in the fifth group?

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Solution

The first column here represents the marks obtained in class interval form. The lowest number in a class interval is called the lower limit and the highest number is called the upper limit. This example is a case of continuous class intervals as the upper limit of one class is the lower limit of the following class.
In continuous cases, any observation corresponding to the extreme values of a class is always included in that class where it is the lower limit. For example, if we had a student who has scored 5 marks in the test, his marks would be included in the class interval 510 and not 05.
Marks of 2 students who are in 5th group is between 2024.

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