设随机变量X的方差存在，则
A: [img=205x46]180398df8db3c08.jpg[/img]
B: [img=207x51]180398df9888bd1.jpg[/img]
C: [img=201x54]180398dfa3efc73.jpg[/img]
D: [img=206x53]180398dfae7b156.jpg[/img]
A: [img=205x46]180398df8db3c08.jpg[/img]
B: [img=207x51]180398df9888bd1.jpg[/img]
C: [img=201x54]180398dfa3efc73.jpg[/img]
D: [img=206x53]180398dfae7b156.jpg[/img]
D
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举一反三
- 设随机变量X的方差存在，则 A: [img=205x46]1803a7e70651e53.jpg[/img] B: [img=207x51]1803a7e71120b83.jpg[/img] C: [img=201x54]1803a7e71c653e8.jpg[/img] D: [img=206x53]1803a7e727682b0.jpg[/img]
- 设随机变量X的方差存在，则 A: [img=205x46]1803cc853d25e99.jpg[/img] B: [img=207x51]1803cc85472b0f4.jpg[/img] C: [img=201x54]1803cc8551c0b81.jpg[/img] D: [img=206x53]1803cc855cf353e.jpg[/img]
- 设随机变量X的方差存在，则 A: [img=205x46]1802df9bae249b9.jpg[/img] B: [img=207x51]1802df9bb8978cd.jpg[/img] C: [img=201x54]1802df9bc3f9716.jpg[/img] D: [img=206x53]1802df9bcf5ff51.jpg[/img]
- 设随机变量X的方差存在，则 A: [img=205x46]18039e1665cc598.jpg[/img] B: [img=207x51]18039e16710af77.jpg[/img] C: [img=201x54]18039e167d37335.jpg[/img] D: [img=206x53]18039e168a37ca3.jpg[/img]
- 设随机变量X的方差存在，则 A: [img=205x46]1803477251da9f2.jpg[/img] B: [img=207x51]180347725d6a6f7.jpg[/img] C: [img=201x54]180347726981fac.jpg[/img] D: [img=206x53]18034772752f516.jpg[/img]
内容
- 0
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)
- 1
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)
- 2
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)
- 3
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)
- 4
设随机变量X的概率密度为[img=238x47]18034e916ce7029.png[/img]，则D(X)=________。 A: -3 B: 3 C: 2 D: [img=25x26]18034e91750c02e.png[/img]