Cumulative Frequency Distribution of the more than type

Example: Consider the cumulative frequency distribution table as given below.


Marks
No of Students
0-10
5
10-20
3
20-30
4
30-40
3
40-50
3
50-60
4
60-70
7
70-80
9
80-90
7
90-100
8



Solution:
Find the no of students with score more than or equal to lower interval.


Marks
No of Students (f)
Cumulative frequencies (cf)
More than or equal to 0 
5
53
More than or equal to 10
3
53-5=48
More than or equal to 20
4
48-3=45
More than or equal to 30
3
45-4=41
More than or equal to 40
3
41-3=38
More than or equal to 50
4
38-3=35
More than or equal to 60
7
35-4=31
More than or equal to 70
9
31-7=24
More than or equal to 80
7
24-9=15
More than or equal to 90
8
15-7=8

The distribution given above  is called cumulative frequency distribution of the more than type.