Refer to the below data table and answer the following question:
Marks Number of students
40 and above 21
30 and above 45
20 and above 70
10 and above 83
0 and above 95
How many students have scored marks 20 or more but less than 40?

The given data is in cumulative format ("and above").
Number of students scoring 20 and above = 70

Number of students scoring 40 and above = 21

To find the number of students scoring 20 or more but less than 40, we subtract the students who scored 40 and above from those who scored 20 and above:

Number of students=(Students ≥20)−(Students ≥40)
Number of students=70−21=49