Multiple choice

45 is the average marks obtained by 30 students of a class. On rechecking, two errors were identified. On correction, one student obtained 45 more marks while other obtained 15 less marks. What is the average of corrected marks?

  1. 45

  2. 44

  3. 47

  4. 46
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total marks for 30 students = 30 × 45 = 1350. After rechecking, one student gains 45 marks and another loses 15 marks. Net change = +45 - 15 = +30. New total = 1350 + 30 = 1380. New average = 1380 ÷ 30 = 46.

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