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请教一个Statistical Concepts and Market Returns 的问题

The following ten observations are a sample drawn from a normal population: 25, 20, 18, -5, 35, 21, -11, 8, 20, and 9. The fourth quintile (80th percentile) of the sample is ?

-11
-5
8
9
18
20
20
21
25
35


20,21吧

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