a score of 58 was 2 standard deviations below the mean 就是说58分位于平均分2个标准差之下。58+2 standard deviations的值=mean的值 第三题就是问用4个英文字母或者5个来编股票代码,能编多少个呢? (从你给的答案推出的):四位代码的:26^4;五位代码的:26^5 加起来~就是答案 -- by 会员 molynca0717 (2011/3/7 16:35:51)
谢谢 还想请问一下这道题 of the 60 animals on a certain farm,2/3 are either pigs or cows. How many of the animals are cows? 1. The farm has more than twice as many cows as it has pigs 2.The farm has more than 12 pigs Ans: C 请问2/3 either p or c 指的是 2/3 都是p 或都是c ? 还是这2/3里有p也有c |