GRE数学增加了难度,不过,小编相信,我们中国的考生还是hold住的~~在这种情况下,了解数学词汇,端正数学基本概念和熟悉相应实例非常重要。来看下面这个系列吧。
一元二次方程
ax2+bx+c=o
x12=[-b±(b2-4ac1/2)]/2a
描述统计 Descriptive statistics
mode 众数
一组数中出现频率最高的
极差 range
一组数中最大值与最小值之间的差值
平均数 mean
算术平均 arithmetic mean
几何平均 geometric mean
例题.The circumference of a rectangle is 20
A.The greatest area of the rectangle
B.25
中位数 median
中位数的寻找方法:
1.将所有n个数字按着从大到小或者从小到大排列;
2.如果n=奇,整个序列中位于中间位置的数就是中位数;如果n=偶,中间两个数的算术平均即是中位数。
例题.If the arithmetic mean of a, b, c, 3 and 5 is 6, which of the following must be true?
1.The median of the five numbers cannot be 3
2.At least one of a, b and c is greater than 7
3.The range of the five numbers is 2 or more
A.1 only
B.2 only
C.3 only
D.1 and 3
E.2 and 3
例题.A group of students were tested on data-entry skills, and the number of errors they made and the percent of students making x errors were recorded as follows.
Number of errors
Percent of students
0
1%
1
7%
2
8%
3
25%
4
19%
5
18%
6 or more
22%
1. What is the range for the number of errors made by the students in the sample?
A. 4
B.5
C.6
D.7
E. It cannot be determined from the information given.
2. What was the median number of errors in the sample?
A.3
B.3.5
C.4
D.4.5
E. It cannot be determined from the information given.
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GRE数学满分须知 这6个常见扣分问题要特别当心
GRE数学满分几乎是每个中国考生的既定目标,但根据官方公布数据显示,去年中国考生的数学平均分仅为165分,许多人并没能考到满分。是什么原因导致大家错失满分?小站小编资讯GRE历届高分学员考生,为大家总结GRE数学满分需要特别注意的6个问题,一起来看。
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