Mathematics : Math Misc

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 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 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.



Solution
B. 59.1



Explanation
Sum= Mean × Number of students=1755 Correct total= 1755-57+75=1773 Correct mean= 1773/30=59.1
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