OG数学题

okqishiUID: 3245371

1. percentile韦氏大的解释：

per·cen·tile    n.
Pronunciation:     pər-'sen-ˌtī(-ə)l
Function:           noun
Date:               1885

: a value on a scale of 100 that indicates the percent of a distribution that is equal to or below it

美传统的解释：

percentile  
per.cen.tile  
AHD:  [p…r-sμn“tol”]
D.J.  [p*6sen7ta!l]
K.K.  [p+6sWn7ta!l]
n.（名词）
One of a set of points on a scale arrived at by dividing a group into parts in order of magnitude. For example, a score higher than 97 percent of those attained on an examination is said to be in the 97th percentile.
百分位数：按数量顺序把一组分成部分，其中某个范畴的一组数。例如在考试中比百分之九十七的人都高的分数被称做在第九七区间内

去看OG P272，有讲quartiles 和percentiles

2.“exclusive events”  互斥事件
   “independent events”  独立事件
  高中学过的内容，Math Review也有讲