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]
A: [img=37x34]1803b691e9c5052.jpg[/img]
B: [img=33x33]1803b691f1ca73b.jpg[/img]
C: [img=33x33]1803b691f9c90eb.jpg[/img]
D: [img=33x33]1803b69202c0299.jpg[/img]
举一反三
- 设随机变量X服从泊松分布，且P(X=1)=P(X=2)，则[img=74x25]1803da311754097.png[/img]=( ) A: 0 B: [img=25x22]1803da312041d6d.png[/img] C: [img=56x24]1803da31280b27e.png[/img] D: 1
- 设随机变量X服从泊松分布，已知P(X=1)=P(X=2)，则P(1.5<X<4)= A: [img=100x98]1803b3b73611604.png[/img] B: [img=92x99]1803b3b7409092a.png[/img] C: [img=105x98]1803b3b74af8409.png[/img] D: [img=83x95]1803b3b755583a2.png[/img]
- 设随机变量X服从参数为λ的泊松分布，且P(X=1)=P(X=2)，则P(X>2)= A: [img=47x42]1803b3b6bfeda95.png[/img] B: [img=90x84]1803b3b6c79f558.png[/img] C: [img=92x88]1803b3b6d01ff59.png[/img] D: [img=89x84]1803b3b6d7f2848.png[/img]
- 设随机变量X服从参数为λ的泊松分布，且P(X=1)=P(X=2)，则P(X≥2)的值为 A: [img=98x35]1803b3b9dd898d4.png[/img] B: [img=83x34]1803b3b9e54cd40.png[/img] C: [img=96x34]1803b3b9ec7f1a2.png[/img] D: [img=43x35]1803b3b9f46e15d.png[/img]
- 设随机变量X服从均值为2的指数分布，X的分布函数为F(x)，数学期望为E(X)，方差为D(X)，则以下结果正确的是 A: [img=128x28]1802d3b369ab5fe.png[/img] B: D(X)=4 C: P(X<2︱X>1)=F(1) D: P(X>2︱X>1)= F(1) E: [img=112x27]1802d3b372fb534.png[/img] F: D(X)=E(X) G: P(X≤2︱X>1)= F(2) H: [img=82x27]1802d3b37bbbf05.png[/img]