Answer :
Final answer:
Average sea-level atmospheric pressure is approximately 1013.2 millibars.
Explanation:
Sea-level atmospheric pressure refers to the pressure exerted by the Earth's atmosphere at sea level. The correct approximation for average sea-level atmospheric pressure is 1013.2 millibars. Option 1, 31 inches of mercury, and Option 2, 20 pounds per square inch, are not accurate representations of average sea-level atmospheric pressure. Option 3, 99 kilopascals, is close but not exactly the average sea-level atmospheric pressure.
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