Multiple choice

The average marks of 24 students of a class in Maths is 56. If the marks of three students was mistakenly read as 44, 45 and 61 in place of 48, 59 and 67, then what is the correct average?

  1. 57

  2. 55

  3. 57.5

  4. 58.5

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Total marks = 24 × 56 = 1344. Corrected total = 1344 - (44 + 45 + 61) + (48 + 59 + 67) = 1344 - 150 + 174 = 1368. Correct average = 1368/24 = 57.