[1006G]xiaoyaozi5566的GRE数学解题站

xiaoyaozi5566UID: 2510336

192# bluewatery  
bluewatery 发表于 2010-6-11 00:31

这是哪一题？

crazyskrUID: 2675584

average有两种，一个是mean一个是median，分别是什么意思，如何求得的呢？

prime numbers指的是？



再问两个题目



1.the reasult of multiplying 4Z/5 by 6/7 is_____?





2.if the range of the six measurements 140,125,180,110,165, and x is 80,which o f the following could be the value of x?

a.60

b.85

c.190



3.A membership list of 620 people shows that 31 of them have first and last names that begin with the same letter. If a person is selected at random from the list,what is the probability that the person's first and last names do not begin with the same letter?



a.0.25

b.0.95

c.0.05





谢谢高手指点····

解答：
mean是算术平均数，就是把各个数加起来除以个数。median是中数，是从小到大排列之后居中的那个（如果居中的是两个数，那么取这两个数的平均值）
prime number是质数
1、24Z/35
2、range是指范围，最大值减最小值，答案是190（还有一个答案是100）
3、选B。31个人占5%，剩下的人占95%。题目问的是选到剩下的人的概率，就是0.95
by xiaoyaozi

bluewateryUID: 2733946

192# bluewatery
谢谢啦 后来看到了电子版的题，上面标的很清楚两个角都是x，问x和50的谁大谁小。发现好几道题都是印刷错误的，相信ETS应该还是很严谨的，大家都别担心明天考场上好好考啦。
谢谢~~

江雪UID: 2790520

不是小燕子，是逍遥子。。。

bluewateryUID: 2733946

216# xiaoyaozi5566
我以为我把帖子已经删了呢 没问题了这道题 是印刷错误 谢谢哈

longer_mengUID: 2742451

请教~
23. If the ratio of the number of personal computers sold by IBM ，Compaq, and Tandy (not shown) in 1993 was 6 to 4 to1, respectively, approximately how many personal computers were sold by Tandy in 1993?
(A) 350,000
(B) 400,000
(C) 450,000
(D) 500,000
(E) 550,000
图中给出：1993年   number of personal computers sold（in millions）
               IBM  为  2.1
              Compaq 为  1.4
答案为A
像这种A:B:C 三个一起比的应该怎么做呢？

第二题：
图如下：
     Distance(in mailes) From Centerville
----------------------------------------------------------------------------------------------------
    Freight Train         |         -10t+115
-------------------------------------------------------------------------------------------------
    Passenger Train     |         -20+115   
   

27. The expressions in the table above give the distance of each of two trains from Centerville at t hours after 12:00 noon. At what time will the trains be equidistant from Centerville?
(A) 1:30 p.m.
(B) 3:30 p.m.
(C) 5:10 p.m.
(D) 8:50 p.m.
(E) 11:30 p.m.
万分感谢！
解答：
23. 把2.1除以6就得到1份是多少了，或者1.4除以4也可以
27. 题目完整么？第二行少了个t啊
by xiaoyaozi