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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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What is the percentile rank of the score 20 in a unit normal distribution that has a population mean of 21 and a variance of 4?
It is the 31st percentile.
Which measure is always the 50th percentile Mean Meadian or Upper Quartile?
Mean.
What does the 85th percentile mean for the GRE?
It means that 85% of people are under it
What does being in the 30 percentile mean?
example. a baby is in the 30th percentile for weight. that baby is bigger than 29 babies out of 100, and smaller than 69.
What percentile rank would you be in if you scored a 720 on the GRE when the mean equals 500 and the standard deviation equals 100?
You would be in the 99th percentile (98.61, to be more precise).
