Instructions

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


Question 25

The number of students scoring less than 30 marks is

Solution
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Here we have to find the extreme cases

Let us consider all the students indicated by the graph 20-40 scored more than 30, 

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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