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If the average weight of 6 students is 50 kg; that of 2 students is 51 kg; and that of other 2 students is 55 kg; then the average weight of all students is

A52 kg

B51.2 kg

C51.5 kg

D61 kg

Answer:

B. 51.2 kg

Read Explanation:

average weight=(50×6+51×2+55×2)/10 = 300+102+110/10 = 51.2 kg


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