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It is usually a term used to describe a certain value within a probability distribution. It is used a lot in describing test scores. Someone who scored at the 98.66 percentile on a test would have received a score that was equal to or greater than 98.66 percent of those who also took that test. Sometimes a sample is used and the results are generalized over a total population. In that case someone who scored at the 98.66 percentile would have received a score that is estimated to be equal to or greater than 98.66 percent of a whole population. Congratulations if you scored at the 98.66th percentile. That is very good!

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16y ago

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