设随机变量X与Y的联合概率密度为[img=345x109]180390afa17928a.png[/img]则X的边缘概率密度fX(x) =（ ）.
A: [img=190x73]180390afacbac12.png[/img]
B: [img=184x79]180390afb814127.png[/img]
C: [img=149x76]180390afc383838.png[/img]
D: [img=137x69]180390afcd921b9.png[/img]
A: [img=190x73]180390afacbac12.png[/img]
B: [img=184x79]180390afb814127.png[/img]
C: [img=149x76]180390afc383838.png[/img]
D: [img=137x69]180390afcd921b9.png[/img]
举一反三
- 设随机变量X与Y的联合概率密度为[img=345x109]1802f2b47daf183.png[/img]则X的边缘概率密度fX(x) =（ ）. A: [img=190x73]1802f2b489856ff.png[/img] B: [img=184x79]1802f2b494063d5.png[/img] C: [img=149x76]1802f2b49e579c0.png[/img] D: [img=137x69]1802f2b4a8e3b52.png[/img]
- 设随机变量X与Y的联合概率密度为[img=345x109]1802f2dbde99848.png[/img]则X的边缘概率密度fX(x) =（ ）. A: [img=190x73]1802f2dbe93dd61.png[/img] B: [img=184x79]1802f2dc00b3928.png[/img] C: [img=149x76]1802f2dc0aca008.png[/img] D: [img=137x69]1802f2dc1592878.png[/img]
- 设随机变量X与Y的联合概率密度为[img=345x109]1802e8d327e0ab0.png[/img]则X的边缘概率密度fX(x) =（ ）. A: [img=190x73]1802e8d332f883b.png[/img] B: [img=184x79]1802e8d33ced64b.png[/img] C: [img=149x76]1802e8d3479f588.png[/img] D: [img=137x69]1802e8d35370b4c.png[/img]
- 设随机变量X与Y的联合概率密度为[img=345x109]18031e94c66909e.png[/img]则X的边缘概率密度fX(x) =（ ）. A: [img=190x73]18031e94d18aee2.png[/img] B: [img=184x79]18031e94dc7cf83.png[/img] C: [img=149x76]18031e94e7dc214.png[/img] D: [img=137x69]18031e94f3281a4.png[/img]
- 设随机变量X与Y的联合概率密度为[img=345x109]1803a74ac301b50.png[/img]则X的边缘概率密度fX(x) =（ ）. A: [img=190x73]1803a74acd94225.png[/img] B: [img=184x79]1803a74ad8bfa43.png[/img] C: [img=149x76]1803a74ae287f22.png[/img] D: [img=137x69]1803a74aed55e4b.png[/img]