Question 43

45 is the average marks obtained by 30 students of a class. On checking, two errors were identified. On correction, one student obtained 45 more marks while other obtained 15 less marks. What is the average of corrected marks ?

Solution

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On correction, total increase in marks = 45 - 15 = 30 marks.

Number of students = 30

So, increase in the average = 30/30 = 1 mark.

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