The point with the largest curvature on oval [img=197x51]1803e25424a80ed.png[/img] is
A: [img=40x18]1803e2542d143b3.png[/img]and [img=66x43]1803e2543592c54.png[/img]
B: [img=41x39]1803e2543dcab4c.png[/img] and [img=86x43]1803e2544585a02.png[/img]
C: [img=41x39]1803e2544d51406.png[/img]and [img=111x48]1803e2545530c62.png[/img]
D: [img=50x43]1803e2545e6f4f3.png[/img]and [img=111x48]1803e25466e08ad.png[/img]
A: [img=40x18]1803e2542d143b3.png[/img]and [img=66x43]1803e2543592c54.png[/img]
B: [img=41x39]1803e2543dcab4c.png[/img] and [img=86x43]1803e2544585a02.png[/img]
C: [img=41x39]1803e2544d51406.png[/img]and [img=111x48]1803e2545530c62.png[/img]
D: [img=50x43]1803e2545e6f4f3.png[/img]and [img=111x48]1803e25466e08ad.png[/img]
举一反三
- 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]
- 设投掷1颗骰子的点数为X,则( ) 未知类型：{'options': ['E(X)=3.5,D(X)= [img=29x21]17e43c3db9dc21b.png[/img]', ' E(X)=3.5, D(X)= [img=22x41]17e43c3dc2146ee.png[/img]', ' E(X)=3.5,D(X)=3.5', ' E(X)=3.5,D(X)=[img=22x41]17e43c3dcacf7d1.png[/img]'], 'type': 102}
- 设随机变量(X,Y)在区域｛(x,y): 0<|y|< x <2｝内均匀分布，则以下结果正确的是 A: 当0<x<2时，[img=96x25]1802dded7db6eef.png[/img]. B: E(X)=4/3 C: 当0<|y|<2时,[img=105x45]1802dded872b92f.png[/img]. D: P(X<1)=0.5 E: 当0<x<2时,[img=110x45]1802dded915de6e.png[/img]. F: E(X)=2/3 G: 当0<y<2时，[img=95x43]1802dded9a54300.png[/img].
- 设X为随机变量，若数学期望E(X)存在，则数学期望E(E(X))=__________。 A: E(X) B: 0 C: [img=51x27]18038f919d83a08.png[/img] D: [img=63x27]18038f91a6f0476.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]