Student has to retake highschool

Average IQ is 100, and I would guess not too many college students are successful with an IQ below 100. Maybe I am wrong.
 
From a report by Charles Murray from the Wall Street Journal; Jan. 16, 2007:

There is no magic point at which a genuine college-level education becomes an option, but anything below an IQ of 110 is problematic. If you want to do well, you should have an IQ of 115 or higher. Put another way, it makes sense for only about 15% of the population, 25% if one stretches it, to get a college education. And yet more than 45% of recent high school graduates enroll in four-year colleges. Adjust that percentage to account for high-school dropouts, and more than 40% of all persons in their late teens are trying to go to a four-year college--enough people to absorb everyone down through an IQ of 104.
 
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Just for fun, this map shows that the state of Iowa is among the highest average IQ states in the US.