A student's marks were wrongly entered as 65 instead of 45. Due to this, the average marks for the class got increased by 1/3. The number of students in the class is:
Answer & explanation
Correct answer: option 3
Let no. of students in class be x
Average marks of class got increased by 1/3
so, increase in total marks = x × \(\frac{1}{3}\) = \(\frac{x}{3}\)
∴ \(\frac{x}{3}\) = 65 - 45
⇒ x = 60