The average marks of 40 students in a class is 72. Later, it was discovered that a student's marks were recorded as 93 instead of 39. What is the correct average?
Show answer & explanation
Correct answer: B
Explanation
Given:
Total students = 40
Average marks = 72
Incorrect marks = 93
Correct marks = 39
Total marks (incorrect) = 40 × 72 = 2880
Correct total marks = 2880 − 93 + 39 = 2826
Correct average = 2826 / 40 = 70.65