The average weight of 10 students was calculated as 50 kg. Later, it was discovered that one student's weight was wrongly read as 40 kg instead of 60 kg. What is the correct average weight?
Show answer & explanation
Correct answer: B
Explanation
Incorrect average weight = 50 kg
Incorrect total weight of 10 students = 10 × 50 = 500 kg
The weight was mistakenly read as 40 kg, whereas the correct weight was 60 kg.
Difference = 60 - 40 = 20 kg
Correct total weight = 500 + 20 = 520 kg
Correct average weight = 520/10 = 52 kg