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A percentile is the value of a variable below which a certain percent of observations fall. So the 20th percentile is the value (or score) below which 20 percent of the observations may be found. The term percentile and the related term Percentile Rank are often used in Descriptive Statistics as well as in the reporting of scores from norm-referenced tests. The 25th percentile is also known as the first Quartile ; the 50th percentile as the Median . |
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