The marks scored by students in mathematics in a certain examination are given below: Marks scored 1 – 20 21 – 40 41 – 60 61 – 80 81 – 100 Number of students 3 8 19 18 6

3. The marks scored by students in mathematics in a certain examination are given below:
Marks scored
1 – 20
21 – 40
41 – 60
61 – 80
81 – 100
Number of students
3
8
19
18
6

Solution:
Let us make the continuous class interval.


Marks scored
Extended Class
Number of students.
1 – 20
0.5 – 20.5
3
21 – 40
20.5 – 40.5
8
41 – 60
40.5 – 60.5
19
61 – 80
60.5 – 80.5
18
81 – 100
80.5 – 100.5
6



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