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 24

The number of students scoring at least 50 marks is

Solution

Share

let all the students in the group 40-60, score atleast 50,

Then the number off students who score atleast 50 = 30+15+10= 55

Percentage = (55/80)*100 = 68.75%

let all the students in the group 40-60, score less than 50,

Then the number off students who score atleast 50 = 15+10= 25

Percentage = (25/80)*100 = 31.25%

C is the correct answer.

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