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UPSC CDS 1 2021 Math Paper

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Direction:(52-55) The following table shows the marks of 90 students in a test of 80 marks:

Marks	Number of students
1-10	5
11-20	8
21-30	10
31-40	13
41-50	18
51-60	17
61-70	12
71-80	7

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Question : 55

Total: 100

The marks obtained by 5 students are 21, 27, 19, 26, 32. Later on 5 grace marks are added to each student. What are the average marks of the revised marks of the students?

26
30
31
32

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