Susan is traveling and asked me to respond. I think I understand your questions.
There were actually 453 responses to the survey. The report is based on the 372 respondents who met the minimum net worth requirement ($800,000 to be among the wealthiest 10% of U.S. households per Federal Reserve Board research) and who responded before the cut off for data tabulations.
The FRB research reports an average income of $256,000 for the wealthiest 10% of U.S. households. An average income of $267,000 was reported by the respondents in the survey by the American Affluence Research Center.
I hope this is the information you were seeking.
