刘同学2018-05-18 13:34:15
The following 10 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 24. B 8. C 21. 这题为什么不用(n+1)*80*=8.8,在数第八和第九之间那样做呢?
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银矿石2018-05-18 13:56:25
同学你好,是这道题的答案错了,应该是比较老的题目了,像老师上课讲的那么做就可以。
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