Abhishek's marks in Mathematics were incorrectly entered as 93 instead of 63. Due to this, the average marks of the class in Mathematics got increased by 0.5. How many students were there in the class?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 60.
Difference = 93 - 63 = 30
The average increased by 0.5 marks.
Let the number of students in the class = x
So, 0.5x = 30
⇒ x = 30/0.5 = 60
Therefore, there were 60 students in the class.