Again, the word you are looking for is atypical, not abnormal -- that is, if you're trying to talk about facts.
Atypical is a factual description. It means, "not typical." A quality in a population shared by 10% of the members is unarguably atypical. Left-handedness? Atypical. Homosexuality? Atypical. IQs higher than 120 or lower than 80? Atypical. Being 7' tall? Atypical.
Normality is a judgment about the way things should be. It is not a factual concept. Indeed, the origin of the word "normal" is the same as "normative." which is expressly a concept about value judgments. And perhaps you've heard of social norms, which are informal rules that people are expected to follow because they are supposedly virtuous. All of this amounts to the same thing.
This is not controversial. This is my last post on the subject because, as I anticipated, you're unwilling to admit that you used the wrong word. Should it be considered a personal failing that you confused "atypical" with "abnormal"? It should not. I worked for a well-regarded appeals court judge who confused "effect" and "affect." It meant he made a mistake, not that he was an idiot. Alas. Neurologists talk of a testosterone response to being wrong. Some men in particular experience a drop in T after losing an argument, which is a fancy way of saying that you're thinking with your testes.
Finally, other posters have given you examples of situations involving atypicality that are never described as abnormal. I'll do one better. Lebron James and Michael Jordan are among the most atypical people on the planet. To be blessed with the size, athleticism, drive, skills, coordination, intelligence that they have is indeed extraordinary. It's not simply that they are the two best players in NBA history; they are pretty far above #3. I've never once heard them described as "abnormal." Have you? And to extend the point, NBA players themselves are highly atypical people. The vast majority of them are exceptionally tall compared to the average person, and they have other distinguishing factors. Have you ever heard them referred to as abnormal?