The average weight of a class of 115 students is 52.4 kg. If the average weight of the 63 boys is 60 kg, then find the average weight (in kg) of the girls in the class.
(Rounded off to one decimal place)
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 43.2.
Total weight of all students = 115 × 52.4 = 6,026 kg
Total weight of boys = 63 × 60 = 3,780 kg
Total weight of girls = 6,026 − 3,780 = 2,246 kg
Number of girls = 115 − 63 = 52
Average weight of girls = = 43.2 kg