在GMAT数学的备考中，了解GMAT数学词汇和对数学概念的了解都是很重要的，在GMAT考试中，经常过出现关于数学统计的问题,今天智课小编就此问题来做一个详细的分析，希望对大家备考起到帮助。

数学统计的解题策略。

在参加GMAT考试前，大家都会细心备考GMAT数学词汇，除此之外，GMAT数学备考之描述统计，包括：平均数、中数、众数、值域以及标准方差。

GMAT数学备考之描述统计(descriptive statistics)

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 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.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.

以上是智课小编总结的数学统计的解题策略。在GMAT考试中，GMAT数学的概念和GMAT数学词汇会令学生们头疼，学生们通常觉得复杂和混乱，智课小编建议，生最好采用理解式记忆法，GMAT数学基本概念就能轻松搞定。

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