What would be the total weight of all humans on Earth combined, approximately, if the average weight of a human is 40 kg and the population is 8 billion?
Correct answer: B. 320 billion kg
- A. 7 billion kg
- B. 320 billion kg
- C. 320 million kg
- D. 2 billion kg
Explanation
The total weight of all humans on Earth can be calculated by multiplying the average weight of a person, 40 kg, by the global population, 8 billion. This gives us a total of 320 billion kg. Option A, 7 billion kg, suggests an average weight of less than 1 kg, which is far too low. Option C, 320 million kg, implies an average weight of 0.04 kg per person, which is not possible. Option D, 2 billion kg, assumes an average weight of 0.25 kg per person, which is also incorrect.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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