小伙伴们，GMAT考试大家复习的怎么样了呢？下面是帮考网分享的一些GMAT考试数学部分的相关资料，一起来看看吧！

在GMAT数学备考中，首先需要了解一部分的GMAT数学概念。只有搞清楚GMAT数学概念，才不至于发生因为看错题目而造成的一些不必要的错误。下面分享的是GMAT数学概念之统计(descriptive statistics)：

1.平均数(average or arithmetic mean)

2.中数(median)

To calculate the median of n numbers，first order the numbers from least to greatest;if n is odd，the median is defined as the middle number，while if n is even，the median is defined as the average of the two middle numbers. For the data 6, 4, 7, 10, 4, the numbers, in order, are 4, 4, 6, 7, 10, and the median is 6, the middle number. For the numbers 4, 6, 6, 8, 9, 12, the median is (6+8 )/2 = 7. Note that the mean of these numbers is 7.5.

3.众数(mode)：一组数中的众数是指出现频率最高的数。

例：the mode of 7，9，6，7，2，1 is 7。

4.值域(range)：表明数的分布的量，其被定义为最大值减最小值的差。

例：the range of–1，7，27，27，36 is 36-(-1)= 37。

5.标准方差(standard deviation)：

One of the most common measures of dispersion is the standard deviation. Generally speaking, the greater the data are spread away from the mean, the greater the standard deviation. The standard deviation of n numbers can be calculated as follows:

(1)find the arithmetic mean ;

(2)find the differences between the mean and each of the n numbers ;

(3)square each of the differences ;

(4)find the average of the squared differences ;

(5)take the nonnegative square root of this average.

Notice that the standard deviation depends on every data value, although it depends most on values that are farthest from the mean. This is why a distribution with data grouped closely around the mean will have a smaller standard deviation than data spread far from the mean.

如果考生将GMAT数学概念加以归类，思路会更清晰。考生可以根据归类的GMAT数学概念加以复习。对于GMAT数学概念切莫死记硬背，在理解的基础进行记忆一方面是比较方便记忆，一方面还能真正理解单词的含义，提高准确性。

部分常用词汇：

proper fraction 真分数

improper fraction 假分数

mixed number 带分数

vulgar fraction，common fraction 普通分数

simple fraction 简分数

complex fraction 繁分数

numerator 分子

denominator 分母

(least)common denominator (最小)公分母

quarter 四分之一

decimal fraction 纯小数

infinite decimal 无穷小数

recurring decimal 循环小数

tenths unit 十分位

好了，以上就是今天分享的全部内容了，各位小伙伴根据自己的情况进行查阅，希望本文对各位有所帮助，预祝各位取得满意的成绩，如需了解更多相关内容，请关注帮考网！