Question 59

The average marks in Science subject of a class of 20 students is 68. If the marks of two students were misread as 48 and 65 of the actual marks 72 and 61 respectively, then what would be the correct average ?

Solution

Number of students = 20

Average marks = 68

Total marks in science = 20 x 68 = 1360

It is given that two students were misread as 48 and 65 of the actual marks 72 and 61 respectively

So new total will be 1360-(48+65)+(72+61) = 1380

Correct average = $$\frac{1380}{20}$$ = 69

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