The average marks of 17 students was 180. But later it was found that the score of one student was wrongly entered as 72 instead of 27. What is the correct average of their score?

Correct option is C

Given:
Average of 17 students = 180, Wrong score = 72, Correct score = 27
Formula Used:
Corrected Total = Original Total - Wrong Score + Correct Score
Correct Average =$$\frac{\text{Corrected Total}}{17}$$​​
Solution:
Original Total = $$17 \times 180 = 3060$$​​
Corrected Total = 3060 - 72 + 27 = 3015
Correct Average = $$\frac{3015}{17} = 177.35$$​​