Multiple choice

The average marks obtained by a student in 9 subjects are 98. On subsequent verification it was found that the marks obtained by him in a subject were wrongly copied as 86 instead of 68. The correct average of the marks obtained by him is:

  1. 94

  2. 95

  3. 96

  4. 97
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Original sum = 9 * 98 = 882. Difference = 86 - 68 = 18. Correct sum = 882 - 18 = 864. Correct average = 864 / 9 = 96.

AI explanation

The initial total marks are 9 subjects times an average of 98, which equals 882. The error in the total is 86 minus 68, meaning the total was incorrectly inflated by 18 marks. Subtracting this 18 from the initial total gives the correct sum of 864, and dividing this by 9 gives the correct average of 96.

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