In a 100-mark test, the average of marks scored by 50 students was found to be 65. Later on, it was discovered that a score of 88 was misread as 68. Find the correct average.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 65.40.
Total wrong marks = 50 × 65 = 3250
Correct total = 3250 - 68 + 88 = 3270
Correct average = = 65.4