Frequency Distribution

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.











9th Grade Math

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