The average weight of 10 students is 42 kg. If 3 students of average weight of 43 kg are added and two other students of average weight of 48 kg are also added, then find the average weight of all the students.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 43 kg.
Average weight of 10 students = 42 kg
⇒ Total weight = 10×42 = 420 kg
3 students with average weight 43 kg ⇒ Total = 3 × 43 = 129 kg
2 students with average weight 48 kg ⇒ Total = 2 × 48 = 96 kg
Total weight of students = 420 + 129 + 96 = 645 kg
Total no. of students = 10+3+2=15
Average weight = 645/15 = 43 kg