In the "Arena Matchmaking System FAQ" thread that was posted on the WoW PvP Disussion forum, the Blue named Aratil posts that, "Being 1300 means you are better than 25% of all teams." Also that, "To be 1650, your team needs to be better than 68% of all teams."
I've been looking around for the source of those numbers. I looked at the Elo System entry on Wikipedia and found a chart that says if a team is rated +200 from base (base being 1500) then they are in the 75th percentile (meaning better than 75%). Also that if a team is -200 from base, then they are in the 25th percentile.
This would seem to be in line with what Alatil says of a 1300 team being better than 25% of all teams, but doesn't quite hold true for a 1650 team being better than 68% of all. A 1650 team would be better than 70%. Close, but not exact, and I want to know why.
So basically what I'm asking is if there is a more specific source for these numbers, or if there is an actual formula that exists to find the percentile based on the rating above or below base.
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Also, somewhat unrelated, but the maximum rating in arena is still 3000, correct? Someone was saying it was raised to 3750. And arena points are still calculated the old way, before teams started at 0 rating, correct? I haven't played in a while.