- UID
- 198621
- 帖子
- 24
- 主题
- 4
- 注册时间
- 2010-12-28
- 最后登录
- 2012-12-9
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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.
为什么答案不是 C? 不是应该用 (n+1) (Y/100) 这个公式吗? |
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