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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
The number of students scoring less than 80 marks but not less than 40 marks = 30+15 = 45
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