How exactly does the XP penalty effect the grp?

[VincentVolaju]

So many people are worried about the XP penalty it seems like, I am just wondering how exactly it is split among the group? Does it give the majority of the XP to the ppl with penalties, or does the penalty split between everyone evenly so every ends up with like 5-10% more xp to get? As in, say theres a 5man group, 4 ppl have no penalty, 1 person has 50%. Does that mean everyone has a 10% penalty now?