GMAT数学辅导:算术知识点全解析(标准方差)-查字典英语网
搜索1
所在位置: 查字典英语网 >留学英语 > GMAT > GMAT数学 > GMAT数学辅导:算术知识点全解析(标准方差)

GMAT数学辅导:算术知识点全解析(标准方差)

发布时间:2016-03-02  编辑:查字典英语网小编

  GMAT数学辅导:算术知识点全解析

  5.标准方差:

  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.

  

点击显示

推荐文章
猜你喜欢
附近的人在看
推荐阅读
拓展阅读
  • 大家都在看
  • 小编推荐
  • 猜你喜欢
  •