While note down of marks scored in an examination by the students of a class, by mistake the marks scored by one student got recorded as 86 in place of 68 and thereby the average marks increase by 0.6 . What was the number of students in the class?
Answer & explanation
Correct answer: option 4
Difference in marks due to mistake = 86 - 68 = 18
According to question ,
.6 unit = 18
1 unit = 30
So, Total number of students = 30