设随机变量X和Y满足[img=303x43]17e4442c4384368.png[/img],则[img=138x22]17e4442c4e7cf90.png[/img]( ).
未知类型:{'options': ['', ' [img=11x33]17e43b6c766158c.jpg[/img]', ' [img=11x33]17e4431b48f6e37.jpg[/img]', ' [img=11x33]17e4442c165ad52.jpg[/img]'], 'type': 102}
未知类型:{'options': ['', ' [img=11x33]17e43b6c766158c.jpg[/img]', ' [img=11x33]17e4431b48f6e37.jpg[/img]', ' [img=11x33]17e4442c165ad52.jpg[/img]'], 'type': 102}
举一反三
- 设随机变量(X,Y)的联合密度函数为f(x,y)=[img=11x33]17e0a705ae7bd6c.jpg[/img]xy,0<;x<;y<;2,则)P(X<;1,Y<;2)= 未知类型:{'options': ['', ' [img=21x34]17e0abc58cd38f8.jpg[/img]', ' [img=18x33]17e0abc597504cc.jpg[/img]', ' [img=11x33]17e0a705ae7bd6c.jpg[/img]'], 'type': 102}
- 设随机变量[img=99x39]1802e2aa37f8c6a.jpg[/img],则E(X)=( ). A: [img=11x33]1802e2aa410560f.jpg[/img] B: [img=11x33]1802e2aa49bc493.jpg[/img] C: [img=18x33]1802e2aa51fb455.jpg[/img] D: 5
- 已知随机变量X的分布列如下:[img=386x130]17e43ec4c459e73.png[/img],则E(X)= A: 17/30 B: m未知,无法求出 C: -30/17 D: -17/30
- 随机变量X的分布列为[img=311x121]17e0b62484ec7b1.jpg[/img]则[img=108x22]17e0b6248fc6ea4.jpg[/img]() 未知类型:{'options': ['1', ' [img=11x33]17e0a68c101c165.jpg[/img]', ' [img=11x33]17e0a7058f08913.jpg[/img]', ' [img=11x33]17e0a705ae7bd6c.jpg[/img]'], 'type': 102}
- 设随机变量X,Y相互独立且都服从[0,1]上的均匀分布,则[img=130x19]17e442d7434f012.jpg[/img] 未知类型:{'options': ['', ' [img=11x33]17e437126a9c40e.jpg[/img]', ' [img=11x33]17e4362c08c9977.jpg[/img]', ' [img=11x33]17e43634e3f7891.jpg[/img]'], 'type': 102}