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In a prep school, the average weight of 30 girls in a class among 50 students is 16 kg and that of the remaining students is 15.5 kg. What is the average weight of all the students in the class ?
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- 15.2 kg.
- 15.8 kg.
- 15.4 kg.
- 15.6 kg.
- 15.2 kg.
Correct Option: B
The average weight of 30 girls = 16 kg
Total weight of 30 girls = 16 × 30
The average weight of remaining 20 boys = 15.5 kg
Total weight of 20 boys = 15.5 × 20
| Required average weight = | 30 × 16 + 20 × 15.5 |
| 50 |
| Required average weight = | 480 + 310 | = | 790 | = 15.8 kg |
| 50 | 50 |
