The histogram below represents marks of students in a Mathematics exam with passing marks as 30. For finding the number of failed students, what is the class interval that needs to be considered?
A
15 - 30
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B
0 - 30
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C
15 - 45
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D
30 - 100
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Solution
The correct option is B 0 - 30 If the pass mark is 30, the students who scored less than 30 marks are failed. So to find the number of students with less than 30 marks, the class interval 0 - 30 is considered and the frequency of the class interval is found.