The average weight of 45 students in a class is 52 kg.. Five of them whose average weight is 48 kg leave the class and other 5 students whose average weight is 54 kg join the class. What is the new average weight (in kg) of the
class ?
Sum of the weights of the students after replacement
= [(52 x 45) - (48 x 5) + (54 x 5)] kg 2370 kg.
`:.` New average = `(2370/45)` kg = `53 2/3` kg.
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