>>13630073Because you've been manipulated by incomplete statistics.
Bra sizes have two metrics: Cup size and strap length. Whether someone's breast size is large or not can only be determined by the COMBINATION of the two. It's possible to have an A cup with sizeable breasts if the strap length is short enough. And do you know what the effect of being a disgusting fat fuck is on someone's cup size? That's right, it increases massively! Instantly the NA cup size average is explained.
Add that to the fact that some cultures are completely ignorant about strap lengths and routinely have women wear the wrong size bra with straps that are way too long, and you end up with a survey that should have 3-4 more factors considered before it enters the realm of meaningfulness.