There are two groups A and B of a class consisting…

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There are two groups A and B of a class, consisting of 42 and 28 students respectively. If the average weight of group A is 25 kg and that of group B is 40 kg, find the average weight of the whole class.

  1. A. 69 kg
  2. B. 31 kg
  3. C. 70 kg
  4. D. 30 kg

Answer: Option B

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Solution(By ExamCraze Team)

According to the question,
Average weight of whole class
= $$frac{42 × 25 + 28 × 40}{70}$$
= $$frac{1050 + 1120}{70}$$
= 31 kg

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