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)
A: D(X)
B: 1
C: [img=58x66]1803c07d00c9eff.png[/img]
D: a 2D(X)
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]17de6027232ca89.png[/img] 未知类型：{'options': ['D(X)', '1', '', 'a 2D(X)'], 'type': 102}
- 1.设随机变量X的密度为[img=186x61]18034ea953ec9dd.png[/img]则常数A=________，概率[img=146x25]18034ea95d30d08.png[/img]__________. A: A=2，P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] B: A=-2，P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] C: A=2，P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img] D: A=-2，P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img]