设[img=215x27]1803b693bb7572e.png[/img],且X与Y相互独立,则[img=76x21]1803b693c3778b9.png[/img]
A: [img=54x25]1803b693cb7816d.png[/img]
B: [img=63x25]1803b693d3eafb1.png[/img]
C: [img=68x25]1803b693dc2bc66.png[/img]
D: [img=63x25]1803b693e3a3028.png[/img]
A: [img=54x25]1803b693cb7816d.png[/img]
B: [img=63x25]1803b693d3eafb1.png[/img]
C: [img=68x25]1803b693dc2bc66.png[/img]
D: [img=63x25]1803b693e3a3028.png[/img]
举一反三
- 设随机变量X ~N(20,16),Y ~ N(10,9),且X与Y相互独立,则X+Y服从 分布. A: [img=72x25]1803da1181e05ce.png[/img] B: [img=72x25]1803da118a52c9a.png[/img] C: [img=63x25]1803da1192f9401.png[/img] D: [img=72x25]1803da119c1e51a.png[/img]
- 设随机变量X ~N(20,16),Y ~ N(10,9),且X与Y相互独立,则X+Y服从 分布. A: [img=72x25]18033806a49a26b.png[/img] B: [img=72x25]18033806ae72df3.png[/img] C: [img=63x25]18033806b7d30a7.png[/img] D: [img=72x25]18033806c059242.png[/img]
- 设随机变量X ~N(20,16),Y ~ N(10,9),且X与Y相互独立,则X+Y服从 分布. A: [img=72x25]1803da16459ed17.png[/img] B: [img=72x25]1803da164ddaee2.png[/img] C: [img=63x25]1803da16579d0b0.png[/img] D: [img=72x25]1803da165f948f1.png[/img]
- 设三阶方阵[img=117x75]17da6265af67565.png[/img]有特征值[img=36x21]17da6265c0f8ef3.png[/img],则[img=26x15]17da6265d451088.png[/img] ,[img=27x17]17da5b7f743dcc3.png[/img] . A: x=1, y=1 B: x=2, y=1 C: x=3, y=0 D: x=0, y=3
- 设X~N(1,1), Y~N(1,4), X与Y相互独立,则[img=170x46]18038d342f95fa6.png[/img] . A: [img=54x25]18038d3438f2121.png[/img] B: [img=54x25]18038d3442f412f.png[/img] C: [img=42x27]18038d344aa7d87.png[/img] D: [img=42x27]18038d34519bfc0.png[/img]