In a class of 50 students 10 have failed and their average of marks is `2.5` . The total marks secured by the entire class were 281. Find the average marks those who have passed.

Explanation

Given: N = 50, Failed Students = 10
Mean marks of those who failed = `2.5`
Total marks secured by the entire class = 281
Total marks obtained by those who have passed = 281 - 25 = 256
Average marks obtained by those who have passed = `(256)/40 = 6.4`
Average marks obtained by those who have passed = `6.4`.