The average weight of 24 persons in a group is 72 kg. If 3 persons with average weight 78 kg leave the group and 4 persons of average weight 75 kg join the group, then what will be the average weight (in kg) of the persons in the group now?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 71.76.
Given:
The average weight of 24 persons in a group is 72 kg.
3 persons with average weight 78 kg leave the group and 4 persons of average weight 75 kg join the group
Formula used:
Average = Sum of observation/number of observation
Calculations:
Total weight = 72 × 24 - 78 × 3 + 75 × 4
= 1728 + 300 - 234 = 1794
Total number of persons in the group = 24 + 4 - 3 = 25
Required average weight = 1794/25 = 71.76 kg