The average weight of 30 girls in a class among 50 students is 16kg and that of the remaining students is 15.5kg. What is the average weight of all the students in the class?
Answer & explanation
Correct answer: option 2
Boys Girls
20 30
2 : 3
15.5 16
Avg = \(\frac{15.5 \; × \;2 + 16 \; × \; 3}{5}\) = 15.8