Here we will discuss about the frequency distribution with examples.
(i) Unclassified Frequency Distribution:
Marks Obtained 4 20 30 39 40 45 49 50 65 70 79 80 90 Total 
Number of Students 3 7 7 1 3 5 1 9 2 5 1 2 4 50 
In the above table we have an example of unclassified
frequency distribution. It shows the number of students obtaining certain
marks. For example, the table shows 4 marks were attained by 3 students, 20
marks were obtained by 7 students, etc. So the frequency of 4 marks is 3, the
frequency of 20 marks is 7, etc.
(ii) Classified Frequency Distribution:
Marks Obtained From 0 to under 20 From 20 to under 40 From 40 to under 60 From 60 to under 80 From 80 to under 100 
Number of Students 3 15 (i.e., 7 + 7 + 1) 18 (i.e., 3 + 5 + 1 + 9) 8 (i.e., 2 + 1) 6 (i.e., 2 + 4) 
Total number of students = 50
In the above table we have an example of classified frequency distribution. It shows the number of students obtaining marks between two numbers. For example, the table shows that 3 students obtained marks from 0 (included) to 20 (excluded), 15 students obtained marks from 20 (included) to 40 (excluded), etc. So the frequency of the class 0 to 20 (excluded) is 3, the frequency of the class 20 to 40 (excluded) in 15, etc.
The frequency of a class is the number of values of the variable appearing in the class.
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