A student determines that 8.2 milligrams of oxygen is dissolved in a 1000 gram sample of water at 15°C and 1.0 atmosphere. In terms of saturation, what type of solution is this sample?
We don't know.
I think you have posted this before with the same result. The answer is we don't know. We haven't been given the solubility of oxygen in water at a given temperature; nor have we been given the Henry's laws constant. We don't even know whether you mean 1 atmosphere of air, or 1 atmosphere of oxygen.