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无论是参加过或者正准备参加GMAT数学考试的考生，都发现了GMAT数学基本概念名目种类繁多，记忆起来困难重重。其实，他们没有将GMAT数学的所有基本概念归类，造成记忆出现混乱。GMAT数学的基本概念真的有那么多吗?我们应该如何把握?且看本文给你晒晒。 八.描述统计 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: | 
