The weight of a person was entered incorrectly as 83 kg instead of 63 kg. As a result, the average weight of a group of people increased by 500 gm. What is the total number of people in the group?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 40.
The weight of a person was entered incorrectly as 83 kg instead of 63 kg.
Let the total number of people = x
ATQ -
The total increase in average weight of people = (500/1000) × x = x/2 kg
The total increase in average weight of people = 83 - 63
x/2 = 83 - 63
x/2 = 20
x = 40