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OpenStudy (anonymous):
in a large population, very close to 25% of the observations will fall below the 25th percentile (Q1), and close to 75% fall below the 75th percentile (Q3). The website of the Educational Testing service reports that on the SAT Mathematics test, with a possible perfect score of 800, the 96th percentile of 1,475,623 scores nationwide is a score of 720. What is the best estimate of exactly how many scores were below 640
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