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The average marks of student in 5 subjects are 77. Later, marks in one subject were increased by 15. Find the correct average of marks.


1. 90
2. 82
3. 86
4. 80

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Correct Answer - Option 4 : 80

Given:

The average marks of student in 5 subjects are 77.

Formula used:

Sum of observations = average × numbers of observations

Calculation:

Sum of all numbers = 77 × 5 = 385

Later, marks in one subject were increased by 15.

⇒ Correct marks = 385 + 15 = 400

∴ Correct Average = Correct sum / number = 400 / 5 = 80

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