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According to the circle graph, 17% of the average percentage breakdown of demographics in public schools in the United States are Black, non-Hispanic.
If a U.S. public school has 1,000 students, then 17% of 1,000 is 0.17 * 1,000 = 170. Therefore, we can expect that 170 students are Black, non-Hispanic in a public school with 1,000 students.