某人打靶命中率为0.8,若独立地射击5次,则5次中最多命中2次的概率为( )
A: [img=21x27]1803bbe466774f3.png[/img]0.800.25
B: [img=21x27]1803bbe46e8e8d7.png[/img]0.820.23
C: [img=21x27]1803bbe466774f3.png[/img]0.800.25+[img=21x27]1803bbe480095f0.png[/img]0.810.24+[img=21x27]1803bbe46e8e8d7.png[/img]0.820.23
D: [img=344x56]1803bbe493809fd.png[/img]
A: [img=21x27]1803bbe466774f3.png[/img]0.800.25
B: [img=21x27]1803bbe46e8e8d7.png[/img]0.820.23
C: [img=21x27]1803bbe466774f3.png[/img]0.800.25+[img=21x27]1803bbe480095f0.png[/img]0.810.24+[img=21x27]1803bbe46e8e8d7.png[/img]0.820.23
D: [img=344x56]1803bbe493809fd.png[/img]
举一反三
- 某人打靶命中率为 0.8,若独立地射击 5 次,则 5 次中最多命中 2 次的概率为 ( ) 未知类型:{'options': ['1803bbe2677c732.png 0.800.25', '1803bbe2709ade8.png0.820.23', '1803bbe2677c732.png0.800.25 +[img=21x27]1803bbe28127e68.png[/img]0.810.24 + [img=21x27]1803bbe2709ade8.png[/img]0.820.23', ''], 'type': 102}
- 某人打靶命中率为0.8,若独立地射击5次,则5次中最多命中2次的概率为( ) 未知类型:{'options': ['1803bbe466774f3.png0.800.25', '1803bbe46e8e8d7.png0.820.23', '1803bbe466774f3.png0.800.25+[img=21x27]1803bbe480095f0.png[/img]0.810.24+[img=21x27]1803bbe46e8e8d7.png[/img]0.820.23', ''], 'type': 102}
- 设随机变量X服从b(2,p)分布,随机变量Y服从b(3,p)分布。若[img=90x41]17e441ea7c518a0.png[/img] 则[img=63x26]17e441ea85da5ea.png[/img]= A: 8/27 B: 4/9 C: 19/27 D: 5/9
- 设随机变量X与Y独立,并且它们的方差分别为[img=129x23]1803214d9aaaac3.png[/img],则[img=97x25]1803214da2bf6ed.png[/img]( ) A: 27 B: 21 C: 15 D: 9
- 设随机变量X与Y独立,并且它们的方差分别为[img=129x23]18032090b41744b.png[/img],则[img=97x25]18032090bd1b70e.png[/img]( ) A: 27 B: 21 C: 15 D: 9