It's the difference between understanding in some abstract way and internalizing. Once you've internalized a concept something that is so far out of whack woul

It's the difference between understanding in some abstract way and internalizing. Once you've internalized a concept something that is so far out of whack would immediately look wrong. For example: 23894739 x 23894739 = 2 I would expect anyone who has internalized the rules of multiplication to immediately and intuitively reject that. Not that they could tell you what the correct answer is, but know that can't be it at a glance. The claim is that the concept that the arithmetic mean is going to be somewhere between the extreme values in a list is simple and fundamental enough that it should have been similarly internalized by university students.