RRB NTPC Mains or Stage 2 Model Paper 6 with solutions

Question : 29 of 119

Marks: +1, -0

The average marks of 65 students in a class was calculated as 150. It was later realised that the marks of one of the students was calculated as 142, whereas his actual marks were 152. What is the actual average marks of the group of 65 students ? (Rounded off to two digits after decimal)

151.25
150.15
151.10
150.19

Validate

Solution:

(b) Actual average marks

={65× 150 +152- 142}/65= {9750- 10}/65 = 150.15

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