设随机变量[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]不相关,则下列结论中正确的是
未知类型:{'options': ['[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]与[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]独立', '[tex=10.286x1.286]EYi5uESR56BqZrC2vVUBuGpi1ai245KKtBQEqxbt3A8=[/tex]', '[tex=10.286x1.286]KJ6W8dDXn9Xh0bJXl+ch6ERulQ1Lj18M444phv2kQz4=[/tex]', '[tex=7.857x1.286]he1BpmA5JnEO6j4N24IZSnsLePnMCoaGBbBV+yK6WUE=[/tex]'], 'type': 102}
未知类型:{'options': ['[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]与[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]独立', '[tex=10.286x1.286]EYi5uESR56BqZrC2vVUBuGpi1ai245KKtBQEqxbt3A8=[/tex]', '[tex=10.286x1.286]KJ6W8dDXn9Xh0bJXl+ch6ERulQ1Lj18M444phv2kQz4=[/tex]', '[tex=7.857x1.286]he1BpmA5JnEO6j4N24IZSnsLePnMCoaGBbBV+yK6WUE=[/tex]'], 'type': 102}
举一反三
- 设随机变量[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]都服从[tex=2.143x1.286]dboSCjP3Fn5+xkkJFCNE+A==[/tex]分布,证明: “[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]不相关”与“[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]独立”等价.
- 设[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]是两个相互独立的随机变量,[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]在[tex=2.929x1.286]kvrkODQf0L3CKREOEdSkuA==[/tex]上服从均匀分布,[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]的概率密度为[tex=10.571x2.429]DRJq+C1mHjswrEZ8FtvX7HNGAPrBLJ6gzRGG2ilTN7MM55jZEydQmT0AUl0Qb5hAT5k9ols3J/KpgflWFdX4TQ==[/tex],求:(1)[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]的联合概率密度;(2)[tex=4.714x1.286]dbgFLPFxgdKKXnbc/gnthjs3iie6rgn/UEwrXH27vHI=[/tex] .
- 若[tex=9.143x1.286]q0YOOtLF9hwo4O7JAlWgxg83Id/7fltxVRWuyyNpn3I=[/tex],则 未知类型:{'options': ['[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]相互独立', '[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]与[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]不相关', '[tex=9.357x1.286]yHxVvI6MGHt4oq+xh/n7TYyFoSO2IItQrnijzP2hzzg=[/tex]', '[tex=11.714x1.286]jkB8Igz3/R76+8O6IBql5PboiiKXx/vnBBG08yIagJw=[/tex]'], 'type': 102}
- 若随机向量[tex=2.786x1.286]d8ZGztHRaPoTHI8v2JwIGQ==[/tex]服从二维正态分布,则①[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex],[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]一定相互独立;②若[tex=3.5x1.286]sKaD0gq7ZfmqhDuxwY0565jK5tQQMeY1a44eA15r+0I=[/tex],则[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex],[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]一定相互独立;③[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]都服从一维正态分布;④若[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex],[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]相互独立, 则[tex=6.143x1.286]1FUpcitV2qNzFaSobaOhNfKUbfF8QOwkW6yD2rc0W2g=[/tex],几种说法中正确的是 A: ①②③④ B: ②③④ C: ①③ D: ①②④
- 设随机变量[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]的方差存在,证明:[tex=10.143x1.286]HG2ihwjcXTdzCTS/bC0QJsaC65j3BHkkW1/8B8OIxFg=[/tex]是[tex=0.929x1.286]uswT/CEcOIwMpCvTz/zeaA==[/tex]和[tex=0.857x1.286]h9C4nePGcGllh55hxKIsUw==[/tex]不相关的充分和必要条件.