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 21

The number of students scoring less than 60 marks is

Solution

The number of students scoring less than 60 = 5+20+30=55


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