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.
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1,5,50
50th percentile or median
Median = 50th percentile or 2nd quartile or 5th decile.
D1=P10; D2=P20;D3=P30, and so on. For every one decile you multiply by 10 to get the percentile.