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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，最好理解记忆。下面在线GMAT为大家列出了GMAT数学概念中描述统计 部分词汇： 1.平均数 2.中数 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 /2 = 7. Note that the mean of these numbers is 7.5. 3.众数：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：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 of1，7，27，27，36 is 36-= 37。 5.标准方差： 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: | 
