The average mark obtained by 100 students is 40. But is was later found that the mark of one student was wrongly written as 83 instead of 53. Find the value of the actual mean.

The average marks of 40 students in an examnation was 25. It was later found that the marks of one student had been wrongly entered as 73 instead of 37.What is the value of correct average?

The average marks of 18 students in an examination was 60. It was later found that the marks of one student had been wrongly entered as 63 instead of 36. The correct average is:

In an exam, the average marks of 40 students is 75. Afterwards, it is found that the marks of 2 students are taken wrong as 56 and 38 instead of 65 and 69. Find the correct average.

Mean marks obtained by 100 students are estimated to be 40. Later on its is found that one value was read as 83 instead of 53. Find out the ''corrected'' mean.