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UPSC Civil Services 2019 Prelims General Studies Paper II
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© examsnet.com
Question : 72
Total: 80
The average marks of 100 students are given to be 40. It was found later that marks of one student were 53 which were misread as 83. The corrected mean marks are
39
39.7
40
40.3
Validate
Solution:
Total marks of 100 students
=
40
×
100
=
4000
correct mean marks of 100 students
=
4000
−
(
83
−
53
)
100
=
39.7
© examsnet.com
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