设[tex=0.857x1.0]N7iCrOsS+NNEUUlnsYCi1g==[/tex]的分布律为：[img=242x105]1790c2a61ccdfd0.jpg[/img]求：（1）[tex=1.571x1.0]pGYiD18r66gsUrCx6KlaQA==[/tex]；（2）[tex=4.429x1.357]3sp5UFGvGZj4HHBU1G6J+Q==[/tex]；（3）[tex=3.143x1.571]oibOEPzqOMutspJWiy6hN9XiV3OZWuBA3Kqc1r8O6C4=[/tex]；（4）[tex=1.714x1.0]X5FdyNclpf2RVybCBYcR8g==[/tex]。

2022-06-04

设[tex=0.857x1.0]N7iCrOsS+NNEUUlnsYCi1g==[/tex]的分布律为：[img=242x105]1790c2a61ccdfd0.jpg[/img]求：（1）[tex=1.571x1.0]pGYiD18r66gsUrCx6KlaQA==[/tex]；（2）[tex=4.429x1.357]3sp5UFGvGZj4HHBU1G6J+Q==[/tex]；（3）[tex=3.143x1.571]oibOEPzqOMutspJWiy6hN9XiV3OZWuBA3Kqc1r8O6C4=[/tex]；（4）[tex=1.714x1.0]X5FdyNclpf2RVybCBYcR8g==[/tex]。

答案：

由随机变量[tex=0.857x1.0]N7iCrOsS+NNEUUlnsYCi1g==[/tex]的分布律，得[tex=14.214x10.071]I08GkjPu5ilZ1cL3oVOjRD//lAy+9bl2wepp8p8YkGT4Bc5gL5l6BjUKHMOrD/PoRp1S/vZGm3iBTb1/HpwOG5e7s6pShaR7fDyR9NtM+JUxRweafZUOZqs9eScspGHFjkQm6HqiAx8ZPamm0UAJlkojJuOfN0HlJigrttDvt7Y8Qv8cyC4A1J6RfkFAey1oC4ARhBpMKdWxGLvTvJvQJSELompvNBYamHmBpSp9t3yZuUkVF/P/I3RizI5MWorgD+ySfkiqC67qlsGXe+nuqqZiGjgyXPuIT2X3pMxEgd2KqFUDqxyhFS/wObX+0aQtkt7h5mm/FMqjirjGmmnDPkRqV1ovuSG23CAktcnOwdvBUwoIUwgkwNoAjwgr8sDd[/tex]所以[tex=23.571x2.357]QRa9n8t/PyDnBXfTMkBBxP8P/e1UmLWx+NVSzUS2FuRr5pH5OUwPjdE1RC9IrO/LsbsFzvDfgHd/92V21Jj1I5o3WoV3OZ8sBPXmK8emtH7qZCJGLEdUFBSogdieFdxw8Hk3iMKA2R7zn85PILPZzL0Lztj+1CLlOtsnyOYKwPa4TSoo5APWNIZTwcLow2Pl[/tex][tex=25.643x2.357]t1j1m9KiqZQdQkg0qIzfBHRw0Kg8tmVZM47RJFhnG83kjWfLILIk9JJZvlXpuA+CN1lb62re+srm/6djXLCypJrP6HtdK5KaIn5S3ierWmEaTxbn++PPWT5d6ZAhs1FLlwC5LWmglsL5lSOXgas1Z0XB1VCS+FmkHciYRtCw8bcH4mB6o73Nr1maW282Veyc[/tex][tex=23.429x2.357]oibOEPzqOMutspJWiy6hN53ZB37udHCQDyGcDlETSMbSD+hwsGOApVM9E2OZnhcjEvEMa/BrtWkizFtC5rP7Iwf5u4iS/bCsZqOrSF4D7n2iEkS1Lob0ZuG6QBAXQymduKybV3sBXxJ8acjXHmbueKmsRNJuEWwaKaC8FaID71fHjGA3vT9oYAb4Meo6S7auT7vNw/+OBHi6599YXZii7g==[/tex][tex=19.071x2.929]ArzG9fsc1O5CSjQrVfIsQBsTlygih8DpH2S+CH2ooSYc6Xg7ZjqpZj4yv2roqXCiIMmC4ccwAmzXasvNmEDaM4Yqlfty+P7Uq7EXbW/aNzmdCUIcBx8U4WrEyBa2198l[/tex]另外，也可根据数学期望的性质可得：[tex=15.214x2.357]9MZ80nm0V9+hyA+QcmZ1jT5X53hFu2Hiyafium7oRvP7NYghblCrT5Qh4aV4orUC[/tex]

举一反三

内容

0
设随机变量X的分布律为P{X=-1}=1/6, P{X=0}=1/3, P{X=1/2}=1/6, P{X=1}=1/12, P{X=2}=1/4, 则E(X²)= ( ). A: 1/3 B: 2/3 C: 31/24 D: 4/3
1
袋中有6个球，标号为1,-1,1,2，从中任取一球，[tex=0.857x1.0]N7iCrOsS+NNEUUlnsYCi1g==[/tex]表示取到之球的标号，求[tex=4.5x1.143]vuVvyXgoPDG7qmmKGIYk7lQlwp3zOq/wlyBkoYUWEFU=[/tex]时，分布函数[tex=2.0x1.357]XiwLhO8FnROM2q2R1tcKSw==[/tex]的值为(). 未知类型：{'options': ['1/6', '3/6', '2/6', '4/6'], 'type': 102}
2
设[tex=18.929x1.357]9ksvKuSQewmOUilvHJMqoUYJoOz1CizMvXxFigJ+rDUTdeJarfYdogNFQBYTi+Uxxe2Ahk7GHObYz2ikDRsC5W09MezIu5FwGXYhaa0QZnZCKP5wj1f8B5FAEGqINPNu[/tex]是[tex=1.0x1.214]q11VAhrhEcavde+jDhwTig==[/tex]的子群。（1）求|G|，给出G的每个函数。（2）说明函数g：g(1)=2,g(2)=3,g(3)=1不在G中，给出陪集G g。（3）证明G g≠g G.（4）在[tex=1.0x1.214]q11VAhrhEcavde+jDhwTig==[/tex]中，G有多少个不同的陪集？
3
袋中有6个球，标号为-1,1,1,2,2,2，中任取一球，[tex=0.857x1.0]N7iCrOsS+NNEUUlnsYCi1g==[/tex]表示取到之球的标号，求[tex=5.286x1.143]cL8CQQEK+38ye7dxsDK+v9132Y+lINLqiXtTPs74+4Q=[/tex]时，分布函数[tex=2.0x1.357]XiwLhO8FnROM2q2R1tcKSw==[/tex]的值为(). 未知类型：{'options': ['1/6', '3/6', '2/6', '4/6'], 'type': 102}
4
以下数组定义中,错误的是( )。 A: int<br/>x[2][3] ={1, 2, 3, 4, 5, 6} ; B: int<br/>x[][3] ={0} ; C: int<br/>x[][3] ={{1, 2, 3} , {4, 5, 6} } ; D: int<br/>x[2][3] ={{1, 2} , {3, 4} , {5, 6} } ;