标题: 求解sample exam, afternoon, Q20 [打印本页]

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作者: Cpchung    时间: 2011-11-20 11:27     标题: 求解sample exam, afternoon, Q20

Q20 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 closest to:
A. 8.0.
B. 21.0.
C. 24.2.

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作者: sy8111    时间: 2011-11-22 23:42

难道不是21 ？

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作者: for99reg    时间: 2011-12-1 23:03

用（n+1）*0.8的那个公式，应该是21+08*（25-21）=24.2吧

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