X~B(n.p)什么意思

2024-12-03 21:45:44
推荐回答(4个)
回答1:

1、X~B(n.p)中x遵循二项分布,试验次数为n,单次概率p;

2、二项分布是由伯努利提出的概念,指的是重复n次独立的伯努利试验;

3、在每次试验中只有两种可能的结果,而且两种结果发生与否互相对立,并且相互独立,与其它各次试验结果无关,事件发生与否的概率在每一次独立试验中都保持不变,则这一系列试验总称为n重伯努利实验,当试验次数为1时,二项分布服从0-1分布。

扩展资料:

图形特点

(1)当(n+1)p不为整数时,二项概率P{X=k}在k=[(n+1)p]时达到最大值;

(2)当(n+1)p为整数时,二项概率P{X=k}在k=(n+1)p和k=(n+1)p-1时达到最大值。

注:[x]为不超过x的最大整数。

应用条件

1.各观察单位只能具有相互对立的一种结果,如阳性或阴性,生存或死亡等,属于两分类资料。

2.已知发生某一结果(阳性)的概率为π,其对立结果的概率为1-π,实际工作中要求π是从大量观察中获得比较稳定的数值。

参考资料来源:百度百-二项分布

回答2:

服从项数为n,概率为p的二项分布

回答3:

指随机变量X 服从参数为(n,p)的二项分布。其期望=np,方差=np(1-p)

回答4:

意思是说,执行n次,有概率是p的这项,另有概率是1-p为那项

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