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07-13
gre考试改革后,很多考生都觉得题难,如果觉得复习gre数学考试比较难不妨从这些题目练习开始,每篇都是按照分类给大家列举了一些典型题目,本篇主要是针对gre数学考试算术方面的典型题目及答案。
GRE数学:关于算术的重点试题练习(附答案)
1.At College C there are from 2 to 4 introductory philosophy classes each semester, and each of these classes has from 20 to 30 students enrolled. If one semester 10 percent of the students enrolled in introductory philosophy failed, what is the greatest possible number who failed?
A.12
B.10
C.8
D.6
E.3
答案:A
2.In each of the years 1983 and 1984, the total number of automobiles sold in the United States was 1.2 million more than in the previous year.
Percent increase in the number of automobiles sold in 1983 over 1982
Percent increase in the number of automobiles sold in 1984 over 1983
答案:A
3.A school district has 1989 computers, which is approximately one computer for every 68.6 students. Of the following, which is the closest approximation, in thousands, of the number of students in the school district?
A.30
B.120
C.140
D.160
E.200
答案:C
4.If the sum of five consecutive even integers is 70, what is the value of the greatest of the five integers.
A.12
B.14
C.18
D.20
E.22
答案:C
5.The sum of the first 50 positiv...
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1、To find the median of data given by percentage(按比例求中位数)给了不同年龄range, 和各个range的percentage, 问median 落在哪个range里. 把percentage加到50%就是median的range了.担小心一点,range首先要保证是有序排列.
Example for this:
Given: 10~20 = 20%, 30~50 = 30%, 0~10 = 40%, 20~30 = 10%, 问median在哪个range里.
分析: 千万不要上来就加,要先排序,切记!重新排序为: 0~10 = 40%, 10~20 = 20%, 20~30 = 10%, 30~50 = 40%. 然后从小开始加, median(50%)落在 10~20这个range里.
如果觉得比较玄乎,我的方法,GRE大部分的题都可以这么搞。0~10岁 40匹ETS猪,10~20岁 20匹ETS猪,20~30岁匹ETS猪,30~50岁 匹ETS猪,这100匹ETS猪按着年龄排下来,你说第五十匹ETS猪的年龄落在那个范围。(原题: 说一堆人0-10岁占 10%,11-20岁 占 12%,21-30岁 占 23%,31-40岁 占 20%,〉40岁 占35%,问median 在什么范围?)
2、比较,当n<1时,n,1,2 和1,2,3的标准方差谁大standard error 和 standard variation (作用=standard deviation)都是用来衡量一组数据的离散程度的统计数值,只不过由于standard error中涉及绝对值,在数学上是很难处里的所以,都用标准方差,实际上standard error更合理一些,它代表了数据和平均值的平均距离.很明显题目中如果n=0的话,0,1,2的离散程度应该和1,2,3的离散程度相同.如果 n<0,则n,1,2,的离散程度大于后者,而0Key: n是整数, 前〉=后(n=0,等;n=-1,-2,……大于
3、算数平均值和加权平均值
三组数据的频数分布FREQUENCY DISTRIBUTION:
1(6),2(4),3(1),4(4),5(6)
1(1),2(4),3(6),4(4),5(1)
1(1),2(2),3(3),4(4),5(5)
其中括号里的是出现的频率,问MEAN和AVERAGE相等的有那些.
答案:只有第二个.
mean-arithmetic mean 算术平均值(1+2+3+4+5)/ 5 = 3
average-weighted average 加权平均值: (1*1+2*4+...5*1)/(1+4+6+4+1)=48/16=3
4、正态分布题
一列数从0到28,给出正态分布曲线.75%的percentile是20,85%的percentile是r,95%的percentile是26,问r与23的大小.
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