1.a score of 58 was 2 standard deviations below the mean 这是什么意思
2.of the 60 animals on a certain farms,2/3 are either pigs or cows
请问either……or…… 意思是 2/3 或者是pig 或者是cows (包不包括两者都是的意思?)
就像咱们学的数学 A或B 的含义是 或A或B或(A和B)
3.All of the stocks on the over-the counter market are designated by either a 4-letter ot a 5-letter code that is created by using the 26 letters of the alphabet.Which of the following gives the max number of different stocks that can be disignated with these codes?
Ans: 27(26^4)
这题没看懂?
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 sta ...
JoshwuS 发表于 2011-3-23 19:38
太谢谢了 我懂了作者: pfullsomer 时间: 2011-3-24 19:44
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作者: philipyu1025 时间: 2011-3-25 06:59