This article debunks the Washington Post claim about a majority of kids in public school being in poverty.
http://marginalrevolution.com/marginalrevolution/2015/01/no-...
http://marginalrevolution.com/marginalrevolution/2015/01/no-...
edit:
[1] http://www.cps.edu/About_CPS/At-a-glance/Pages/Stats_and_fac...
[2] http://www.census.gov/quickfacts/table/PST045215/1714000