若随机变量X的方差D(X)存在,a为常数,则[img=249x67]17de6027232ca89.png[/img]
未知类型:{'options': ['D(X)', '1', '', 'a 2D(X)'], 'type': 102}
未知类型:{'options': ['D(X)', '1', '', 'a 2D(X)'], 'type': 102}
举一反三
- 若随机变量X的方差D(X)存在,a为常数,则[img=249x67]1802f2c16f96412.png[/img] A: D(X) B: 1 C: [img=58x66]1802f2c17877038.png[/img] D: a 2D(X)
- 若随机变量X的方差D(X)存在,a为常数,则[img=249x67]1802f2c2b6e46d0.png[/img] A: D(X) B: 1 C: [img=58x66]1802f2c2bf3c80f.png[/img] D: a 2D(X)
- 若随机变量X的方差D(X)存在,a为常数,则[img=249x67]18031e9705442a0.png[/img] A: D(X) B: 1 C: [img=58x66]18031e970dc4937.png[/img] D: a 2D(X)
- 若随机变量X的方差D(X)存在,a为常数,则[img=249x67]1803c07cf914aaa.png[/img] A: D(X) B: 1 C: [img=58x66]1803c07d00c9eff.png[/img] D: a 2D(X)
- 1.设随机变量X的密度为[img=186x61]17de8981070b17c.png[/img]则常数A=________,概率[img=146x25]17de8981130ab0e.png[/img]__________. 未知类型:{'options': ['A=2,P(X>;1|X<;2)=[img=39x24]17de89811f6f1b0.png[/img]', 'A=-2,P(X>;1|X<;2)=[img=39x24]17de89811f6f1b0.png[/img]', 'A=2,P(X>;1|X<;2)=[img=47x44]17de89812b3a28c.png[/img]', 'A=-2,P(X>;1|X<;2)=[img=47x44]17de89812b3a28c.png[/img]'], 'type': 102}