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# 第八章 概率与数理 - PowerPoint PPT Presentation

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### 第八章 概率与数理

8.2 离散型随机变量的概率分布

n个取值,则取到每个值的概率都是1/n .

1袋内装有五个白球,三个黑球,从中任取两个球,

（1）pk 0, k＝1, 2, … ;

（2）

2

3

4

5

6

1,2,3,4,5,6，随机抛掷这个正方体，用表示朝上

1. 两点分布（也称（0-1）分布）

8

3 某批产品共100件,其中98件是合格品,2件是不合

2. 二项分布

3件,试求三件中恰有二件不合格品的概率.

“有放回”是指每次试验完成后都把试验品放回原产

5 一批出口商品共10000件,已知该批商品的不合格

3. 泊松分布

5中,

,查泊松分布表