Here's an interesting news article.
Blah blah blah, wear your sunscreen.
Anyway, it has some interesting statistics...
"35% of the national public score above average."
"Our goal is to move the needle so that we have 45% or even 50% starting to score in the A or B range [ie, above the national average]."
(of course, this is just proof that the average is not the end-all be-all statistic to quote)