设随机变量X的分布律为X=-2,0,1 Pk=0.4,0.3,0.3 则E(X)= E(3(X平方)+5)= D(X)=设随机变量X的分布律为X=-2,1 Pk=0.0.0.3 则E(X)= E(3(X平方)+5)= D(X)=
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/27 12:32:14
![设随机变量X的分布律为X=-2,0,1 Pk=0.4,0.3,0.3 则E(X)= E(3(X平方)+5)= D(X)=设随机变量X的分布律为X=-2,1 Pk=0.0.0.3 则E(X)= E(3(X平方)+5)= D(X)=](/uploads/image/z/3712967-71-7.jpg?t=%E8%AE%BE%E9%9A%8F%E6%9C%BA%E5%8F%98%E9%87%8FX%E7%9A%84%E5%88%86%E5%B8%83%E5%BE%8B%E4%B8%BAX%3D-2%2C0%2C1+Pk%3D0.4%2C0.3%2C0.3+%E5%88%99E%EF%BC%88X%EF%BC%89%3D+E%EF%BC%883%EF%BC%88X%E5%B9%B3%E6%96%B9%EF%BC%89%2B5%EF%BC%89%3D+D%EF%BC%88X%EF%BC%89%3D%E8%AE%BE%E9%9A%8F%E6%9C%BA%E5%8F%98%E9%87%8FX%E7%9A%84%E5%88%86%E5%B8%83%E5%BE%8B%E4%B8%BAX%3D-2%EF%BC%8C1+Pk%3D0.0.0.3+%E5%88%99E%EF%BC%88X%EF%BC%89%3D+E%EF%BC%883%EF%BC%88X%E5%B9%B3%E6%96%B9%EF%BC%89%2B5%EF%BC%89%3D+D%EF%BC%88X%EF%BC%89%3D)
设随机变量X的分布律为X=-2,0,1 Pk=0.4,0.3,0.3 则E(X)= E(3(X平方)+5)= D(X)=设随机变量X的分布律为X=-2,1 Pk=0.0.0.3 则E(X)= E(3(X平方)+5)= D(X)=
设随机变量X的分布律为X=-2,0,1 Pk=0.4,0.3,0.3 则E(X)= E(3(X平方)+5)= D(X)=
设随机变量X的分布律为X=-2,1 Pk=0.0.0.3
则E(X)=
E(3(X平方)+5)=
D(X)=
设随机变量X的分布律为X=-2,0,1 Pk=0.4,0.3,0.3 则E(X)= E(3(X平方)+5)= D(X)=设随机变量X的分布律为X=-2,1 Pk=0.0.0.3 则E(X)= E(3(X平方)+5)= D(X)=
E(X)=-2*0.4+0*0.3+1*0.3=-0.5,
E(x²)=(-2)²*0.4+0²*0.3+1²*0.3=1.9,
E(3(X²)+5)= 3E(x²)+5=10.7,
D(X)=E(x²)-E²(X)=1.65.
使用百度Hi可以第一时间收到“提问有新回答”“回答被采纳”“网友求助”的通知。查看详情