<p>70% percentile of Northwestern's and 70% percentile of SAT is very different</p>
<p>Everyone takes the SAT.. mental retards, slackers, stupid people, careless people (their parents made them take it), etc.</p>
<p>Northwestern's pool is usually the top of the class...</p>
<p>So its 70th percentile for the 20% of your class..</p>