Statisticsmedium · Past Paper
In a class, the ratio of boys to girls is 3:2. If the mean weight of boys is 50kg and girls is 40kg, the mean weight of the whole class is:
A45 kg
B44 kg
C46 kg
D48 kg
✓ Correct Answer: C — 46 kg
Let boys be 3x and girls 2x. Mean = (3x*50 + 2x*40) / 5x = (150 + 80) / 5 = 230 / 5 = 46 kg.
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