@TV4caster, hopefully some others will chime in with some actual stats, but I’ve never seen a figure cited before, although the question comes up a lot.
My understanding is that UA offers a significant grace period if a student stumbles first semester. Obviously, it has to be possible to raise the GPA enough to get above a 3.0 within another semester, but a student with a 2.8 isn’t going to get the rug pulled out from under him. They generally put students on probation and give them a semester to get it together, as I understand it.
If your student is nervous at all, I would recommend not trying to advance too quickly through the required courses. Unless one is a tippy-top math student, retake calculus, chemistry and physics to guarantee a strong foundation on which the more challenging courses will build. This will also help ensure a strong GPA before entering into the higher-level engineering courses.