== == I have seen a good answer in this answer http://wiki.answers.com/Q/What_does_the_98_Percentile_mean
Percentile is group of 100 people that are divided by the value of particular variable. This is in the 10th percentile of the group weight.
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centile [ˈsɛntaɪl]In mathematics, measurements, or statistics, it is another word for percentile, the ranking a value has within a statistical group. For example, the 99th percentile would be the highest, and 50th percentile most nearly the average.
The top percentile is 100. It represents the maximum score.
Around the 62nd percentile.
The 95th percentile represents an IQ of about 125.
20th percentile = 16th smallest value 60th percentile = 48th smallest value.