设近似值x1,x2满足e(x1)=0.05,e(x2)=0.005,那么e(x1x2)=( ) .
未知类型:{'options': ['0.05[img=35x39]17d61a2f11bd100.png[/img]*0.005[img=38x35]17d61a349478f3d.png[/img]', '0.05[img=35x39]17d61a2f11bd100.png[/img]/0.005[img=38x35]17d61a349478f3d.png[/img]', '0.05[img=35x39]17d61a2f11bd100.png[/img]+0.005[img=38x35]17d61a349478f3d.png[/img]', '0.05[img=35x39]17d61a2f11bd100.png[/img]-0.005[img=38x35]17d61a349478f3d.png[/img]'], 'type': 102}
未知类型:{'options': ['0.05[img=35x39]17d61a2f11bd100.png[/img]*0.005[img=38x35]17d61a349478f3d.png[/img]', '0.05[img=35x39]17d61a2f11bd100.png[/img]/0.005[img=38x35]17d61a349478f3d.png[/img]', '0.05[img=35x39]17d61a2f11bd100.png[/img]+0.005[img=38x35]17d61a349478f3d.png[/img]', '0.05[img=35x39]17d61a2f11bd100.png[/img]-0.005[img=38x35]17d61a349478f3d.png[/img]'], 'type': 102}
举一反三
- 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]
- 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]18033e117e9725e.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]18033e11879f263.png[/img] F: D(X)=E(X) G: P(X≤2︱X>1)= F(2) H: [img=82x27]18033e1190d2ef2.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]18036372a260d4c.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]18036372aa45c90.png[/img] F: D(X)=E(X) G: P(X≤2︱X>1)= F(2) H: [img=82x27]18036372b2a31e1.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]18032aad1d9bd98.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]18032aad25f3c0b.png[/img] F: D(X)=E(X) G: P(X≤2︱X>1)= F(2) H: [img=82x27]18032aad2e07f09.png[/img]