<p>The problem is that if you look at an “A” or a “B” as an objective grade on a points scale, the normal 10% range is so large that it can’t be used to measure anything particularly accurately. If GPA were properly rounded, at most schools it would only have 1 digit. That would be absolutely useless.</p>
<p>I think the choice here is between using a number that isn’t mathematically rigorous and not using a number at all.</p>