數(shù)學(xué)是gmat考試中比較容易拿分的部分，考生們對數(shù)學(xué)得理解是要多多掌握數(shù)學(xué)公式和定理，并且熟練運(yùn)用即可。GMAT數(shù)學(xué)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(dǎo)致理解上出現(xiàn)偏差。下面是小編為大家整理收集的關(guān)于GMAT數(shù)學(xué)統(tǒng)計(jì)類詞匯的相關(guān)內(nèi)容，僅供大家參考。

　　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 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 (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(biāo)準(zhǔn)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.