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In statistics a large set of numerical data is sometimes divided into 100 groups, each consisting of 1% of the data. Beforehand the data are arranged in ascending order. Each of the 99 dividing points is called a percentile of the data set.

The 35th percentile, for instance, has a bigger value than 35% of the datapool.

Some of the percentiles have special names. The 25th, 50th and 75th percentiles are called quartiles. The 50th percentile is also called the median.