First, map the data to the map. This is done by,

Date->Data Mapping Wizard->Shaded Area->US Demo Data

Select Data Field or Column (Households (2002))
Divide by (none)
Show Data By (Census Tract)

Formatting: use Discrete Equal Ranges, use all 8 possible ranges

Once this is done, draw a radius (use the Radius tool from the Drawing toolbar) using your location as the center. MAKE SURE THIS RADIUS STAYS SELECTED.

Next, choose Data->Export to Excel. This exports all of the Census Tracts whose centroid is within the radius circle ALONG WITH the households for each census tract into Excel. From there it's easy enough, of course to add them up.