Discussion
If the weight of A is 54 kg, the weight of B is 56 kg and the weight of C is 64 kg, then what is the average weight of these three people?
Answer: A
The average weight is 58 kg. The average of three values is their sum divided by three.
\[ 54 + 56 + 64 = 174 \]
\[ \frac{174}{3} = 58 \text{ kg} \]
The option 56 kg is the weight of B alone and 54 kg is the weight of A alone, so neither is the mean of the three. The option 60 kg would need a total of 180 kg, which is 6 kg more than the actual total. Only 58 kg matches the sum of 174 kg shared among the three people.
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