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 : 53 of 100
 
Marks: +1, -0
What is the median of the following data?
2,3,−1,2,6,8,9
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