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GMAT数学里你应该复习的那些概念.

刚刚更新 编辑: 浏览次数:203 移动端

  我们在进行GMAT数学备考的时候,可能会有很多概念性的东西都不是很清楚了,在这些概念上出题的可能性是比较大的,所以大家要把这些知识拾起来,再做GMAT数学题的时候就会轻松了,常见的GMAT数学概念有哪些呢?

  下面我们主要列出GMAT数学概念中描述统计(descriptive statistics)部分词汇,希望对大家GMAT数学备考有帮助:

  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.

  以上就是小编整理的GMAT考试数学部分常见的几个概念,GMAT数学对于考生的基础知识要求是比较高的。所以考生们在复习的时候要多多注意,GMAT入门的考生复习数学先从背诵基础知识开始做起吧。

  上面的内容就是对GMAT数学备考中的概念的介绍,希望对大家备考GMAT数学题有帮助,如果想了解更多关于GMAT数学的相关信息,请关注澳际教育平台的GMAT考试频道,小编会为大家持续更新信息,欢迎您的访问。

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