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考研笔记-数学之概率论与数理统计:概率论基本概念

  • 2026-06-25 02:07:23
考研笔记-数学之概率论与数理统计:概率论基本概念

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(一)基本概念

(1)统计规律性:在大量重复试验或观察中所呈现出的固有规律性,称为统计规律性。

(2)随机现象:在个别试验中其结果呈现出不确定性,在大量重复试验中其结果具有统计规律性的现象,称为随机现象。

(3)试验:包括各种科学实验,及对某一事物的某一特征的观察

(4)随机试验:①可以在相同条件下重复进行;②各次试验的可能结果不止一个,且所有可能结果均已知;③每次试验恰好出现可能结果中的一个,但出现哪个结果不确定。

(5)随机试验与随机现象的关系:通过研究随机试验来研究随机现象。

(6)样本空间:随机试验所有可能结果构成的集合,称为随机试验的样本空间。

(7)样本点:样本空间的元素,即随机试验的每个结果,称为样本空间的样本点。

(8)随机事件:随机试验的样本空间的子集,称为随机试验的随机事件。

(9)事件发生:在每次试验中,当且仅当随机事件A对应的子集A*中的一个样本点出现时,称该事件发生。

(10)基本事件:由一个样本点组成的单点集称为基本事件。

(11)复合事件:由多个样本点组成的多点集称为复合事件。

(12)必然事件:样本空间S包含所有样本点,是S自身的子集,在每次试验中它总是发生,称S为必然事件。

(13)不可能事件:空集∅不包含任何样本点,也是样本空间的子集,在每次实验中它都不发生,称为不可能事件。

(14)同一样本空间中的事件包含的样本点数:

必然事件>1概率事件>0概率事件>不可能事件

(15)样本空间的划分:设S为事件E的样本空间,E的一组事件,若①;②,则称为样本空间S的一个划分。若为样本空间的一个划分,则对每次试验,事件中必有且仅有一个发生。

(16)频率:在相同条件下,进行了n次试验,在这n次试验中,事件A发生的次数nA称为事件A发生的频数,比值nA/n称为事件A发生的频率,记为fn(A)

(17)概率:设E是随机试验,S是它的样本空间,对于每一个事件A赋予它一个实数P(A),称为事件A的概率,且P(·)满足:①非负性;②规范性;③可列可加性,对于,有

(18)古典概型:①有限性,只有有限个基本事件;②等可能性,每个基本事件发生的可能性相等。

(19)几何概型:①无限性,具有无限个基本事件;②等可能性,每个基本事件发生的可能性相等。

(20)统计概型:①频率的稳定性,;②适用于一切类型的试验。

(21)概率的公理化定义:

X*为随机试验的基本事件的集合,对有利于事件A的基本事件子集A*指定一个确定的数,事件A概率,且同时满足下列性质,

A是不可能事件,则

A是必然事件,则

,则

,则

X*中的可测子集的集合Ω*应同时满足下列性质,

,则

,则

这样,假设某个集合X*是已知的,在X*的所有子集的集合中分离出满足性质①—③的可测子集的集合Ω*,设函数使每个都对应一个数,且满足性质①—⑤,在这些条件下,称为概率模型或概率空间,X*为基本事件的空间,子集合是事件,值是事件A的概率,将事件A与有利于事件A的基本事件的子集合视为同一的。

以上即为概率的公理化描述。

(22)条件概率:称(其中,)为在事件B发生的条件下事件A发生的概率。(条件概率相当于将事件B对应的样本集合作为事件AB对应的样本集合所在的样本空间

(23)互斥:若,则称事件AB互斥。

(24)对立:若,且,则称事件AB对立。

(25)独立:若,则称事件AB相互独立。独立是概率作为一个数学分支所特有(其他数学分支不具有)的概念之一;

(26)n个事件的相互独立:设n个事件,如果对于其中任意ii=23,…,n)个事件的积事件的概率,都等于这i个事件各事件概率之积,则称事件相互独立。

(27)独立的性质:

(二)概率的五个基本公式

(1)加法

AB互斥,则

(2)减法

,则

(3)乘法

AB独立,则

(4)全概率

前提条件:为样本空间的一个划分

(5)贝叶斯

前提条件:为样本空间的一个划分


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  1. CONNECT:[ UseTime:0.000521s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000746s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000342s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000289s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000487s ]
  6. SELECT * FROM `set` [ RunTime:0.000205s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000567s ]
  8. SELECT * FROM `article` WHERE `id` = 505545 LIMIT 1 [ RunTime:0.000536s ]
  9. UPDATE `article` SET `lasttime` = 1782334047 WHERE `id` = 505545 [ RunTime:0.001404s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000237s ]
  11. SELECT * FROM `article` WHERE `id` < 505545 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000437s ]
  12. SELECT * FROM `article` WHERE `id` > 505545 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000499s ]
  13. SELECT * FROM `article` WHERE `id` < 505545 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000561s ]
  14. SELECT * FROM `article` WHERE `id` < 505545 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001355s ]
  15. SELECT * FROM `article` WHERE `id` < 505545 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001107s ]
0.078663s