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Read the following graph and answer to the questions below.
The following histogram represents the frequency distribution of marks of 80 students in a class. Here the class interval a-b includes all marks greater than or equal to a and less than b except for the interval 80-100, where both the end points are included.
No.of Students
                                      Marks
Here we have to find the extreme cases
Let us consider all the students indicated by the graph 20-40 scored more than 30,Â
Then the number of students scored less than 30 = 5
Percentage of students scored less than 30 = $$\frac{5}{80}$$ = 6.25%
Let us consider all the students indicated by the graph 20-40 scored less than 30,
Then the number of students scored less than 30 = 25
Percentage of students scored less than 30 = $$\frac{25}{80}$$ = 31.25%
B is the correct answer.
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