Question
The average weight of 40 students in a class is 50 kg.
If two new students with weights 72 kg and 68 kg join the class, find the new average weight of the class.Solution
ATQ, Required average = (40 × 50 + 72 + 68) ÷ 42
= (2,000 + 140) ÷ 42
= 2,140 ÷ 42
= 51 kg
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