The average marks of 10 students in a class is 100. But a student mark is wrongly noted as 90 instead of 10 then find the correct average marks?
Choices.
A) 78 B) 82 C) 92 D) 91 E) 85

Rationale: "correct avg marks = 100 + ( 10 - 90 ) / 10 avg = 100 - 8 = 92 answer is c"
Answer: C