A recent TIME article, “Steep Hikes for Many Students,” states that the average tuition at a private, not-for-profit college is $21,949 while the average public university tuition is $6,669. These numbers seem high, and unfortunately continue to rise each year.

The article also lists the 14 universities that have the fastest-growing tuition. Top on the list are George State University and University of Arizona, which are both well above the national average for public universities.

If you need to brush up on calculating an average (mean), visit Math & YOU.