I don't have any numbers to show either, I've just constantly read and based from that assumption ever since I started.

I believe TT did some tests in PvP and showed that armour does 5/7 or 5/8 reduction or something, have to dig up the thread as it was awhile back.

I just found it easier to think of 1 armour = 1 damage reduction since mob damages don't really tend to multiply by huge amounts when you also have no armor on.

Then again it'd bring up how much minimum damage mobs do. X_X I have no certainty whatsoever, just if its useful. I could be dead wrong, and wouldn't be surprised if I am. Lol