Question:
The average weight of a group of 20 boys was calculated to be 65 kg and it was later discovered that the weight of a boy was misread as 76 kg instead of the correct weight 66 kg. The correct average weight was:
A66 kg
B63 kg
C65.5 kg
D64.5 kg
Answer:
D. 64.5 kg
Explanation:
Correct average weight = (20 × 65 - 76 + 66)/20 ⇒ 1290/20 ⇒ 64.5 kg