Question

# Marks of 30 students in mathematics test are given in the adjacent grouped frequency distribution.Sl. NoMarksNo of students10−5525−107310−1510415−206520−252If a student gets 10 marks, should he be included in 2nd or 3rd class?

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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 5−10 and not 0−5.∴ A student gets 10 marks, should be included in 3rd group.

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