下列函数为分布函数的是( )
A: [img=141x51]1803da2b9d21074.png[/img]
B: [img=141x51]1803da2baafb831.png[/img]
C: [img=141x51]1803da2bb3d9e0e.png[/img]
D: [img=141x51]1803da2bc1ca4db.png[/img]
A: [img=141x51]1803da2b9d21074.png[/img]
B: [img=141x51]1803da2baafb831.png[/img]
C: [img=141x51]1803da2bb3d9e0e.png[/img]
D: [img=141x51]1803da2bc1ca4db.png[/img]
举一反三
- 下列函数为分布函数的是( ) A: [img=141x51]180357401d989f6.png[/img] B: [img=141x51]180357402bf68e1.png[/img] C: [img=141x51]18035740355d7ed.png[/img] D: [img=141x51]180357404222a29.png[/img]
- 1. 下列函数为分布函数的是( ) A: [img=141x51]18032791d84dfca.png[/img] B: [img=141x51]18032791e08545a.png[/img] C: [img=141x51]18032791e8abeb1.png[/img] D: [img=141x51]18032791f63626f.png[/img]
- 设函数[img=141x51]17e44684b64aaa7.png[/img] ,选择数a =____,可使得f (x)在[img=69x23]17e446849bf62a1.png[/img]内连续.
- 下面这些变量,哪些是无穷大?[img=118x43]1802e077c608aea.png[/img] [img=141x51]1802e077d1eab6b.png[/img] [img=103x34]1802e077db9e70b.png[/img] A: 全是 B: (1)和(2) C: (1)和(3) D: (2)和(3)
- 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]