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

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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