GMAT考试数学常考的几类词汇.

词汇是GMAT考试复习的基础，考生们如果想拿到GMAT数学的高分，那么掌握一些重点词汇是非常重要的。在数学中有几类词汇是常常考到的，下面澳际小编给GMAT入门的同学详细介绍一下：

　　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 dined as the middle number，while if n is even，the median is dined 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.

　　GMAT数学的基本概念，其实没有想象中那么复杂和混乱。可以根据归类的GMAT数学基本概念词汇，加以复习和记忆。值得注意的是，GMAT数学的基本概念，最忌讳的是死记硬背，最好采用理解式记忆法，基本概念就能轻松搞定。

　　上述就是小编分享的GMAT考试数学常见的几类词汇，这些词汇是GMAT数学复习的重点环节。所以GMAT入门的学子要重点的掌握这些词汇，最后祝大家顺利的考出好成绩。

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