How selective is UIUC?

I was researching this school and saw that it has a 59% admission rate, whis is not that selective when compared to other school. In US News it says it has a 62% acceptance rate, which is even less selective. Also, there is a graph where GPA and SAT/ACT scores of admitted students are shown, and they are pretty diverse, having many admitted students all over the graph. However, on many sites it is shown the average SAT scores of admitted students, and they are pretty high, especially math, being the 25th percentile a 700. How come the SAT scores are high but the graph and acceptance rate say the opposite? Maybe the graph is wrong but still the acceptance rate is above average. Just how selective is this school? I know the engineering college is more selective than the others in the school, but how much? Please someone explain, thanks!