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"Mean household income per group" means that each group should be weighed by group size when taking the average. Now, the size of each group is the same number of households so to get the mean household income you just average the group averages.

They are all homogeneous quantities in this case. It's not like I am taking a mean of quantiles or a median of means.

A society committed to the notion that government is always bad will have bad government. And it doesn't have to be that way. — Paul Krugman

by Migeru (migeru at eurotrib dot com) on Fri Oct 14th, 2005 at 08:44:02 AM EST
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Yup, you're right. I wasn't thinking straight.
by MarekNYC on Fri Oct 14th, 2005 at 08:45:56 AM EST
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