Your nickname must contain only latin symbols (a-z,A-Z),numbers (0-9),symbols - and _.long

相关推荐

• Your nickname must contain only latin symbols (a-z,A-Z),numbers (0-9),symbols - and _.long
• 求概率论二维随机变量条件分布的有道计算题已知P{X=m,Y=n}=(p^2)[q^(n-2)],n=2,3,...;m=1,2,...,n-1.P{X=m}=Σ（n=m+1到∞）P{X=m,Y=n}=Σ（n=m+1到∞）(p^2)[q^(n-2)]=(p^2)[q^（m-1）]/(1-q)=pq^(m-1),m=1,2,...中的Σ（n=m+1到∞）(p^2)[q^(n-2)]=(p^2)[q^（m-1）]/(1-q)=pq^(m-1)是怎么得出来的,我的基础不太好,越详细越好,好的我加分.
• 设二维离散型随机变量（X,Y）的联合分布律为,如图,求第四问