A decile is the same in all things - it is 10%. The second
decile is 10-20%
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example of decile
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A decile is a method of splitting up a set of ranked data into
10 equally large subsections. If you're in the 2nd decile, you're
in the top 20%, if your in the 3rd decile your in the top 30%, and
so on. The 2nd decile is a good place to be.