不可不知的GMAT數(shù)學(xué)基本概念
GMAT數(shù)學(xué)是GMAT考試的重要組成，GMAT數(shù)學(xué)概念是最基本的構(gòu)成元素，我們通過學(xué)習(xí)GMAT數(shù)學(xué)概念，了解GMAT數(shù)學(xué)的最基本的出題規(guī)則，從而取得GMAT數(shù)學(xué)部分的了解熟悉。下面GMAT為大家列出了GMAT數(shù)學(xué)概念中描述統(tǒng)計(jì)部分詞匯：
1.平均數(shù)
2.中數(shù)
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.眾數(shù)：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：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 of1，7，27，27，36 is 36-= 37。
5.標(biāo)準(zhǔn)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:
find the arithmetic mean ;
find the differences between the mean and each of the n numbers ;
square each of the differences ;
find the average of the squared differences ;
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(xué)的基本概念，其實(shí)沒有想象中那么復(fù)雜和混亂。可以根據(jù)歸類的GMAT數(shù)學(xué)基本概念詞匯，加以復(fù)習(xí)和記憶。值得注意的是，GMAT數(shù)學(xué)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。最后預(yù)祝大家在GMAT考試中取得好成績！
GMAT數(shù)學(xué)是GMAT考試的重要組成，GMAT數(shù)學(xué)概念是最基本的構(gòu)成元素，我們通過學(xué)習(xí)GMAT數(shù)學(xué)概念，了解GMAT數(shù)學(xué)的最基本的出題規(guī)則，從而取得GMAT數(shù)學(xué)部分的了解熟悉。下面GMAT為大家列出了GMAT數(shù)學(xué)概念中描述統(tǒng)計(jì)部分詞匯：
1.平均數(shù)
2.中數(shù)
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.眾數(shù)：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：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 of1，7，27，27，36 is 36-= 37。
5.標(biāo)準(zhǔn)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:
find the arithmetic mean ;
find the differences between the mean and each of the n numbers ;
square each of the differences ;
find the average of the squared differences ;
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(xué)的基本概念，其實(shí)沒有想象中那么復(fù)雜和混亂。可以根據(jù)歸類的GMAT數(shù)學(xué)基本概念詞匯，加以復(fù)習(xí)和記憶。值得注意的是，GMAT數(shù)學(xué)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。最后預(yù)祝大家在GMAT考試中取得好成績！
