The average marks of 30 students in a class is 62. If the marks of one student were wrongly entered as 82 instead of 62, what is the correct average?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 61.33.
Wrong total marks = 62 × 30 = 1860
Correct total marks = 1860 – 82 + 62 = 1840
Correct average marks = 1840/30 ≈ 61.33