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


Question 23

The arithmetic mean of marks is


There is a discrepancy in this question that appeared in PGDBA 2016. Assuming that the average in each range lies exactly in the middle, we can get the answer to be 51.25. But it has not been mentioned and hence, the question is incorrect.

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