There are 50 students in a class. Their average weight is 45 kg. When one studen

Question

There are 50 students in a class. Their average weight is 45 kg. When one student leaves the class the average weight reduces by 100g. What is the weight of the student who left the class ?

Options:

A . 47.9 kg

B . 49.9 kg

C . 45 kg

D . 50.1 kg

Answer: Option B
Answer: (b)Weight of the student who left = 50 × 45 – 49 × 44.9 = 2250 – 2200.1 = 49.9 kg.

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