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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
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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