Find out the correct average

The average marks of 30 students in a class is 45. While checking two errors were noticed. After correction, one student got 45 marks more and other 15marks less.What isthe corrected average?

  1. 47
  2. 48
  3. 46
  4. 50
Anurag Mishra Professor Asked on 25th January 2016 in Maths.
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  • 1 Answer(s)

    Answer: (3) 46 

    Explanation:-
    The average marks of 30 students in a class = 45
    Then, total marks of 30 students = 45 x 30
    = 1350

    After correction, one student got 45 marks more and other 15 marks less.
    Then, total marks = 30 x 45 + 45 – 15
    = 1350 + 30
    = 1380

    So, the average marks of 30 students = 1380/30
    = 46

    Hence, the correct answer is option (3) 46.

    Anurag Mishra Professor Answered on 28th January 2016.
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