Q. There are two sections A and B of a class, consisting of 42 and 52 students respectively. If the average weight of section A is 40 kg and that of section B is 45 kg find the average weight of the whole class.
Answer: 42.76
Notes: Total weight of (42+52) students = (42 $latex \times$ 40 + 52 $latex \times$ 45) = 1680 + 2340 = 4020 Average weight of the whole class = $latex \frac{4020}{94}&s=1$$latex = 42.76 kg$ Option (d) is the correct answer.

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