Maxperson
Morkus from Orkus
You can try to twist the statistics all you want. When 50% of half-orcs have a 12 or higher, and only 37.5% of gnomes have a 12 or higher, half-orcs are a significantly stronger race. You can't get around that math.I can do the maths. My posts set out the population distribution.
In AD&D, STR 11 is not stronger than STR 10. STR 13 is not stronger than STR 12. And the only way in which STR 11 is stronger than STR 9 is a doubling of BB/LG (from 1% to 2%).
So the fact that for every Gnome of STR 10 there is a Half-Orc of STR 11 is not relevant to showing that the Half-Orcs are actually stronger.