the mean weight of a class of 20 students is 48 kg. two more students weighing 60 kg and 58 kg respectively join the class . what is the weight of the class now ?
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Answer:
20 × 48 = 960
960+ 60 + 58 = 1078
1078 ÷ 22 =49
the weight of the class is now 49 kg
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