In an examination, the mean of marks scored by a class of 30 students was calculated as 58.5. Later on, it was detected that the marks of one student was wrongly copied as 57 instead of 75. Find the correct mean.

In an examination, the mean of marks scored by a class of 30 students

1.	In an examination, the mean of marks scored by a class of 30 students was calculated as 58.5. Later on, it was detected that the marks of one student was wrongly copied as 57 instead of 75. Find the correct mean.
A.	51.9
B.	59.1
C.	20.9
D.	28.9
Answer» C. 20.9

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In an examination, the mean of marks scored by a class of 30 students was calculated as 58.5. Later on, it was detected that the marks of one student was wrongly copied as 57 instead of 75. Find the correct mean.

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