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介紹一些GMAT數(shù)學中的統(tǒng)計詞匯.

2017/08/11 07:38:02 編輯: 瀏覽次數(shù):236 移動端

  數(shù)學是GMAT考試中比較容易拿分的部分,考生們對數(shù)學得理解是要多多掌握數(shù)學公式和定理,并且熟練運用即可。GMAT數(shù)學中有不少的專用詞匯,這是在其他考試部分見不著的。一些詞匯如果掌握不到位就可能導致理解上出現(xiàn)偏差。今天澳際小編帶來的GMAT考試技巧我們主要將一些數(shù)學中常出現(xiàn)的統(tǒng)計類詞匯,供大家參考:

  GMAT數(shù)學基礎詞匯中,有一類詞匯比較特殊,數(shù)量不多,但往往都是特殊詞匯,不是太好理解,那么我們該如何來背誦這些GMAT數(shù)學有關的統(tǒng)計基礎詞匯呢?

  1.平均數(shù)(average or arithmetic mean)

  2.中數(shù)(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.眾數(shù)(mode):一組數(shù)中的眾數(shù)是指出現(xiàn)頻率最高的數(shù)。

  例:the mode of 7,9,6,7,2,1 is 7。

  4.值域(range):表明數(shù)的分布的量,其被定義為最大值減最小值的差。

  例:the range of–1,7,27,27,36 is 36-(-1)= 37。

  5.標準方差(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數(shù)學的基本概念,其實沒有想象中那么復雜和混亂。可以根據(jù)歸類的GMAT數(shù)學基本概念詞匯,加以復習和記憶。值得注意的是,GMAT數(shù)學的基本概念,最忌諱的是死記硬背,最好采用理解式記憶法,基本概念就能輕松搞定。

  以上就是小編整理的GMAT考試中數(shù)學部分的統(tǒng)計詞匯,GMAT數(shù)學不只考察大家對公式定理的掌握程度。對詞匯的掌握也是至關重要的,所以在備考數(shù)學得時候要多積累一些常用詞匯。在考試時就能用的上,多多積累GMAT考試技巧也是很有必要的。

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