16. 只考欧几里德平面,三角形内角和180
17. 直线没有端点
18. 多边形是凸的,闭合的
19. 解析几何一般都是按照比例画的
20. non-empty sets, empty set,intersection, union, disjoint sets or mutually exclusive sets
21. the integers from 0 to 9, inclusive。 包括了10个元素,而during the years from 1985 to 2005 不管说不说inclusive都包括了21年
22. measures of central tendency,measures of position, measures of dispersion
23. 如果有偶数个数,那么median表示按照升序排列的这串数字的中间两个数的算术平均
24. mode可以不只一个
25. quartile可以指那个点,也可以指一个区,比如the cowsweight is in the third quartile of the weights of the herd 这个时候quartile 就是指一个区域group
26. 25th percentile = the firstquartile; the 50th percentile equals the second quartile, or median; the 75thpercentile equals the third quartile.
27. standard deviation of the datarefers to the nonnegative square root of the mean of the squared differencesbetween m and each of the data. also known as the population standard deviationand is not to be confused with the sample standard deviation. Sample standarddeviation is divided by n-1 for technical reasons.
【备战2015GRE数学不可不知的38个常识】相关文章:
最新
2016-03-02
2016-03-02
2016-03-02
2016-03-02
2016-03-02
2016-03-02