A: [img=109x45]18031678ba4df43.bmp[/img]
B: [img=109x45]18031678c4ec7d6.bmp[/img]
C: [img=109x50]18031678cfcd65a.bmp[/img]
D: [img=109x57]18031678dbe07dc.bmp[/img]
举一反三
- 下列关于随机变量 X 的分布函数 F(x) 叙述错误的是（ ） A: [img=109x45]1803e3499a08fb4.jpg[/img] B: [img=132x50]1803e349a5a9b2a.jpg[/img] C: [img=164x46]1803e349b09c04c.jpg[/img] D: [img=617x61]1803e349bb2f306.jpg[/img]
- Which of the following propositions is false,set A = {x,x is an integer and[img=60x23]1803a1c6eebb7a3.png[/img]} ? ( ) A: [img=113x25]1803a1c6f77ce06.png[/img] B: [img=139x25]1803a1c7001fe79.png[/img] C: [img=51x22]1803a1c70863f61.png[/img] D: {x|x is an integer and |x| 4}[img=33x22]1803a1c711a7c63.png[/img]
- Which of the following propositions is false,set A = {x,x is an integer and [img=60x23]1803a1c503ffa04.png[/img]} ? ( ) A: [img=113x25]1803a1c50cc3162.png[/img] B: [img=139x25]1803a1c514e60ea.png[/img] C: [img=51x22]1803a1c51dd52ef.png[/img] D: {x|x is an integer and |x| <4} [img=33x22]1803a1c525cf1bd.png[/img]
- 已知随机变量X的分布函数为[img=136x49]1803b69024c8270.png[/img] ，则X的均值和方差分别为 A: E(X)=2, D(X)=4 B: E(X)=4, D(x)=2 C: [img=162x43]1803b6902cd8bfb.png[/img] D: [img=162x43]1803b69034d9ffd.png[/img]
- 设随机变量X服从泊松分布，且P(X=1)=P(X=2)，则P(X=4)= A: [img=37x34]1803b691e9c5052.jpg[/img] B: [img=33x33]1803b691f1ca73b.jpg[/img] C: [img=33x33]1803b691f9c90eb.jpg[/img] D: [img=33x33]1803b69202c0299.jpg[/img]