The average weight of 40 athletes and 5 trainers is 72 kg. When six more athletes of average weight 65 kg are included in the group, what is the average weight (in kg) of the group? (Rounded off to 2 decimal places)
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e 71.18.
Total people in the original group = 40 athletes + 5 trainers = 45 people
Total weight of the original group:
Average weight = 72 kg
Total weight = 45 × 72 = 3240 kg
Total weight of 6 more athletes = 6 × 65 = 390 kg
New total weight = 3240 + 390 = 3630 kg
New total number of people = 45 + 6 = 51 people
New average weight = 3630 ÷ 51 = 71.18 kg