The average marks of 17 students was 180. But later it was found that the score of one student was wrongly entered as 72 instead of 27. What is the correct average of their score?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 177.35.
The average marks of 17 students = 180
The total marks of 17 students = 180 × 17 = 3060
The score of one student was wrongly entered as 72 instead of 27.
The difference = 72 - 27 = 45
The correct marks of 17 students = 3060 - 45 = 3015
The correct average = 3015/17 = 177.352... ≈ 177.35
Therefore, the correct average score of 17 students is 177.35.