GMAT考试中GMAT词汇是很基础的，而且同学们在进行GMAT考试的时候有些
GMAT考试中同学们需要掌握哪些GMAT词汇，GMAT数学词汇中比较常见的词汇如下：
GMAT数学词汇之平均数(average or arithmetic mean)
GMAT数学词汇之中数(median)
To calculate the median of n numbers，first order the numbers from least to
GMAT数学词汇之众数(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。
GMAT数学词汇之值域(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。
GMAT数学词汇之标准方差(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.
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