Correct Answer - Option 3 : 75.5
Given:
The average marks of student in 5 subjects are 73.
Formula used:
Sum of observations = average × numbers of observations
Calculation:
Sum of all numbers = 73 × 5 = 365
Later, marks in one subject were increased by 12.5.
∴ Correct marks = 365 + 12.5 = 377.5
Correct Average = Correct sum / number = 377.5 / 5 = 75.5