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estimated population around a point qgis

I have a shapefile with points distributed in a polygon. The points are post office locations within a census district. How can I estimate if the post office is a representation of the concentration ...
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Projection Transformations [duplicate]

Possible Duplicate: How can I measure area from geographic coordinates? I created my spatial tables in WGS-84 with SRID:4326, I want to transform them to UTM Projection to measure length ...