Find Out the Correct Average.

The average marks obtained by a student in 6 subjects is 88. On subsequent verification it was found that the marks obtained by him in a subject was wrongly copied as 86 instead of 68. The correct average of the marks obtained by him is:

  1. 86
  2. 87
  3. 85
  4. 84
Monis Rasool Professor Asked on 29th August 2015 in Maths.
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1 Answer(s)

Answer: (3) 85

Explanation:-
The average marks obtained by a student in 6 subjects = 88
Then, the total marks obtained by a students in 6 subjects = 88 x 6
= 528

On subsequent verification it was found that the marks obtained by him in a subject was wrongly copied as 86 instead of 68.

Then, the correct sum of the marks = 528 – (86-68)
= 528 – 18
= 510

Then, The correct average of the marks obtained by him = 510/6
= 85

Hence, the answer is (3) 85.

Anurag Mishra Professor Answered on 31st August 2015.
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