ratios
for example: 2:4 is in proportion with 1:2
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Indiana University's 2014 25th-75th percentile SAT Math Scores are 540-660, meaning 25% of students scored 540 or lower on the Math portion of the SAT, and 75% of students scored 660 or lower (i.e. 25% of students scored 660 or higher).
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The relatively stable interior portion of a continent is a craton.
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