If n is very large and p is small, the P...

题目

If n is very large and p is small, the Poisson distribution may be used to approximate the binomial distribution with:

选项

A.\u03bb=np

B.\u03bb=np(1-p)

C.\u03bb=n\/p

D.\u03bb=n\u221ap

答案

A

解析

If n is very large and p is small, the Poisson distribution may be used to approximate the binomial distribution with λ=np. 如果n非常大而p小，则可以使用泊松分布来近似λ=np的二项分布。