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?
Answer & explanation
Correct answer: option 3
Change in avg. weight of group is 500 gm which is 0.5 kg
Change in total weight of group is 20 kg
So, change in sum = number x change in avg.
Number of people in group = 40