American University's 2014 25th-75th percentile ACT scores are 26-33 on the English section, 24-29 on the Math section, and 26-31 Composite.
20th percentile = 16th smallest value 60th percentile = 48th smallest value.
You can't do this without knowing the distribution of scores.
For a complete definition of Percentile see the related link. A percentile is the value of a variable below which a certain percent of observations fallThe 90th percentile is typically the point at which 10 percent of the highest scores fall.If you assume that scores are out of 40, and that they are evenly distributed (an unlikely event in real life), then the 90th percentile is all scores above 36.
75th percentile
American University's 2014 25th-75th percentile SAT Writing Scores are 580-680, meaning 25% of students scored 580 or lower on the Writing portion of the SAT, and 75% of students scored 680 or lower (i.e. 25% of students scored 680 or higher).
American University's 2014 25th-75th percentile ACT Composite Scores are 26-31, meaning 25% of students scored 26 or lower on the ACT Composite Score, and 75% of students scored 31 or lower (i.e. 25% of students scored 31 or higher).
American University's 2014 25th-75th percentile ACT English Scores are 26-33, meaning 25% of students scored 26 or lower on the ACT English Score, and 75% of students scored 33 or lower (i.e. 25% of students scored 33 or higher).
American University's 2014 25th-75th percentile ACT Math Scores are 24-29, meaning 25% of students scored 24 or lower on the ACT Math Score, and 75% of students scored 29 or lower (i.e. 25% of students scored 29 or higher).
American University's 2014 25th-75th percentile SAT Math Scores are 570-670, meaning 25% of students scored 570 or lower on the Math portion of the SAT, and 75% of students scored 670 or lower (i.e. 25% of students scored 670 or higher).
Baylor's 2014 25th-75th percentile ACT scores are 24-30 on the English section, 24-29 on the Math section, and 24-29 Composite.
Berkeley's 2014 25th-75th percentile ACT scores are 27-34 on the English section, 27-34 on the Math section, and 27-33 Composite.
Bucknell's 2014 25th-75th percentile ACT scores are 27-33 on the English section, 26-31 on the Math section, and 27-31 Composite.