L是圆周[img=161x27]1803c1f6ce1a35f.png[/img]在第一象限部分,[img=93x48]1803c1f6d64142a.png[/img],则
A: [img=64x43]1803c1f6dd6e856.png[/img]
B: [img=64x43]1803c1f6e4df0a7.png[/img]
C: [img=53x22]1803c1f6ede9a88.png[/img]
D: [img=74x43]1803c1f6f64e0a7.png[/img]
E: [img=74x43]1803c1f6fe3a8e7.png[/img]
F: [img=74x43]1803c1f7066e8b7.png[/img]
G: [img=74x43]1803c1f70f1b0f4.png[/img]
H: [img=62x22]1803c1f7179d0cf.png[/img]
I: [img=64x43]1803c1f72031939.png[/img]
J: [img=64x43]1803c1f72897385.png[/img]
A: [img=64x43]1803c1f6dd6e856.png[/img]
B: [img=64x43]1803c1f6e4df0a7.png[/img]
C: [img=53x22]1803c1f6ede9a88.png[/img]
D: [img=74x43]1803c1f6f64e0a7.png[/img]
E: [img=74x43]1803c1f6fe3a8e7.png[/img]
F: [img=74x43]1803c1f7066e8b7.png[/img]
G: [img=74x43]1803c1f70f1b0f4.png[/img]
H: [img=62x22]1803c1f7179d0cf.png[/img]
I: [img=64x43]1803c1f72031939.png[/img]
J: [img=64x43]1803c1f72897385.png[/img]
举一反三
- 设随机变量X的概率密度为f(x),则f(x)一定满足( ). A: 0≤f(x)≤1 B: [img=183x53]1803b451bb3373a.png[/img] C: [img=133x51]1803b451c807078.png[/img] D: f(+∞)=1
- 设[img=143x35]1803b3baa24b1c3.png[/img],其密度函数为f(x),分布函数为F(x),则 A: P(X<0)=P(X>0) B: P(X<1)=P(X>1) C: F(−x)=1−F(x) D: f(−x)=f(x)
- 函数[img=73x26]1803467b5e85eef.png[/img]的极值为( ). A: f(0)=1 B: f(1)=2 C: x=0 D: x=1
- 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]
- 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]18034b986fbc78a.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]18034b98781508a.png[/img] F: D(X)=E(X) G: P(X≤2︱X>1)= F(2) H: [img=82x27]18034b9880d080a.png[/img]