NOTE: Low-poverty schools are those in which 10 percent or less of students are eligible for free or reduced-price lunch, and high-poverty schools are those in which more than 75 percent of students are eligible. To be eligible for the National School Lunch Program, a student must be from a household with an income at or below 185 percent of the poverty level for reduced-price lunch or at or below 130 percent of the poverty level for free lunch. Race categories exclude persons of Hispanic ethnicity.
SOURCE: U.S. Department of Education, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Mathematics Assessment, NAEP Data Explorer.