In a class of 50 students, 40% are girls. The average weight of the boys is 62 kg and that of the girls is 58 kg. What is the average weight (in kg) of the whole class?
A60.4
B60.2
C60.8
D60.6
Answer:
A. 60.4
Read Explanation:
Number of girls = 50 × 40/100 = 20
Number of boys = 50 - 20 = 30
Total weight of boys = 30 × 62 = 1860
Total weight of girls = 20 × 58 = 1160
Total weight of 50 students = 1860 + 1160 = 3020
Average = 3020/50 = 60.4