随机变量X分布律:P{X=k}=a/N,k=1,2,..,N,求a

问题描述:

随机变量X分布律:P{X=k}=a/N,k=1,2,..,N,求a
RT啦...

P{X=k}=a/N
∑a/N=1
a/N+a/N...+a/N=N*a/N=a=1