I did a bit of Googling and I'm pretty convinced that some of the numbers are medians and some are means. What'd be really interesting is a direct side by side of both (perhaps even doing an RP 10% in a third column.)

I might Mechanical Turk that, it'd be worth a few bucks to see.

Hear hear. Also, these statistics are nowhere near the average income tax statistics I saw when I finished my tax returns on Turbo Tax this year. The average income is much, much higher as are some of the other categories (capital gains, etc). I guess there's a big difference between the tax-filing average American family and the overall average?

Here you go: A bit old the data, but still interesting. Net Worth and the Assets of Households 2002: http://www.census.gov/prod/2008pubs/p70-115.pdf

The language is leaving you behind on that one.