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<p>This varies by school. They are probably referring to their own schools.</p>
<p>Here is an example of where specific majors have different thresholds for admission:
<a href=“http://info.sjsu.edu/static/admission/impaction.html”>http://info.sjsu.edu/static/admission/impaction.html</a>
(Note: frosh eligibility index referenced in the above linked pages is GPA<em>800+SAT<em>CR+SAT</em>M or GPA</em>200+ACT*10.)</p>
<p>Since the OP named a specific school (University of Illinois - Chicago), s/he should ask that school’s admissions office and physics department to find out the answer for that school.</p>