假设随机变量X与Y在圆域：<img class=jc-formula data-tex={ x }^{ 2 }+{ y }^{ 2 }\le { r }^{ 2 } src=https://huaweicloudobs.ahjxjy.cn/4E59C7F72A01DDFB5C818DEEB39D61E2.png style=white-space: normal; vertical-align: middle;/>上服从均匀分布，则X与Y不相关。

【判断题】【消耗次数：1】

① 正确

② 错误

参考答案：

复制

纠错

相关题目

【判断题】假设随机变量X与Y在圆域：<img class=jc-formula data-tex={ x }^{ 2 }+{ y }^{ 2 }\le { r }^{ 2 } src=https://huaweicloudobs.ahjxjy.cn/4E59C7F72A01DDFB5C818DEEB39D61E2.png style=white-space: normal; vertical-align: middle;/>上服从均匀分布，则X与Y是相关的。

① 正确

② 错误

查看完整题目与答案

① 正确

② 错误

查看完整题目与答案

① 正确

② 错误

查看完整题目与答案

① 正确

② 错误

查看完整题目与答案

【判断题】假设随机变量X与Y在圆域：<img class=jc-formula data-tex={ x }^{ 2 }+{ y }^{ 2 }\le { r }^{ 2 } src=https://huaweicloudobs.ahjxjy.cn/4E59C7F72A01DDFB5C818DEEB39D61E2.png style=vertical-align: middle;/>上服从均匀分布，则X与Y的相关系数为0

① 正确

② 错误

查看完整题目与答案

【单选题】设二维随机变量（X，Y）服从二维正态分布，则随机变量<img class=jc-formula data-tex=\xi =X+Y src=https://huaweicloudobs.ahjxjy.cn/8F19C9163D467187B671D070AD26E078.png style=vertical-align: middle;/>与<img class=jc-formula data-tex=\eta =X-Y src=https://huaweicloudobs.ahjxjy.cn/1C505FC58B097E2D2518CE63201ED938.png style=vertical-align: middle;/>不相关的充分必要条件为（）

① E(X)=E(Y)

② <img class=jc-formula data-tex=E({ X }^{ 2 })-{ [E(X)] }^{ 2 }=E({ Y }^{ 2 })-{ [E(Y)] }^{ 2 } src=https://huaweicloudobs.ahjxjy.cn/EC69F99ED2421592841FC0EC98BCE859.png style=vertical-align: middle;/>

③ <img class=jc-formula data-tex=E({ X }^{ 2 })=E({ Y }^{ 2 }) src=https://huaweicloudobs.ahjxjy.cn/0FAAA51ECCF44B8A0338267EF166BAC3.png style=vertical-align: middle;/>

④ <img class=jc-formula data-tex=E({ X }^{ 2 })+{ [E(X)] }^{ 2 }=E({ Y }^{ 2 })+{ [E(Y)] }^{ 2 } src=https://huaweicloudobs.ahjxjy.cn/AFD5EA3AE28A174E522891105F9ADDB5.png style=vertical-align: middle;/>

查看完整题目与答案

【判断题】若<img class=jc-formula data-tex=P(X\le x,Y\le y)=P(X\le x)P(Y\le y) src=https://huaweicloudobs.ahjxjy.cn/4E907C78037E0B8AA722D84D91A5465D.png style=vertical-align: middle;/>,则随机变量<img class=jc-formula data-tex=X,Y src=https://huaweicloudobs.ahjxjy.cn/7ADC839F5F3346E7C68A191C8BA75ADA.png style=vertical-align: middle;/>独立。

① 正确

② 错误

查看完整题目与答案

【单选题】设随机变量X的分布函数为<img class=jc-formula data-tex={ F }_{ X }(x) src=https://huaweicloudobs.ahjxjy.cn/C9AA53C55E70D9C9A10EC19860616D92.png style=vertical-align: middle;/>，则Y=3-5X的分布函数为<img class=jc-formula data-tex={ F }_{ Y }(y) src=https://huaweicloudobs.ahjxjy.cn/C6606AD65DF04F9951D7032A6FAC7119.png style=vertical-align: middle;/>=

① <img class=jc-formula data-tex={ F }_{ X }(5y-3) src=https://huaweicloudobs.ahjxjy.cn/AE4AC4605E1695616F4C9F45FB2D964F.png style=vertical-align: middle;/>

② <img class=jc-formula data-tex=5{ F }_{ X }(y)-3 src=https://huaweicloudobs.ahjxjy.cn/716A197607430372E288CE95DF98C9E7.png style=vertical-align: middle;/>

③ <img class=jc-formula data-tex={ F }_{ X }(\frac { y+3 }{ 5 } ) src=https://huaweicloudobs.ahjxjy.cn/43D011CA26A865C7F09E3CAD2C4C1025.png style=vertical-align: middle;/>

④ <img class=jc-formula data-tex=1-{ F }_{ X }(\frac { 3-y }{ 5 } ) src=https://huaweicloudobs.ahjxjy.cn/645270C44359FC04B262389FD61E94A3.png style=vertical-align: middle;/>

查看完整题目与答案

【单选题】设随机变量X,Y相互独立，且<img class=jc-formula data-tex=D(X)=12，D(Y)=16 src=https://huaweicloudobs.ahjxjy.cn/156D835F4C8A6E2AED82BCAA335FF621.png style=vertical-align: middle;/>，则<img class=jc-formula data-tex=D(2X-3Y)= src=https://huaweicloudobs.ahjxjy.cn/F67366E19AD2B4059957086B47984721.png style=vertical-align: middle;/>

① 36

② 66

③ 192

④ 186

查看完整题目与答案

【单选题】自然数里，a=2，f (x,y)=x+y，g (x,y)=x·y，F (x,y): x=y。公式“<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/151E88A53D653382F547CC2EA5D9CEBC.png data-tex=\forall />x<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/151E88A53D653382F547CC2EA5D9CEBC.png data-tex=\forall />y(F(f(x,a),y) <img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/F388E7EE9892B38FECEEB653227F230A.png data-tex=\mapsto />F(f(y,a),x))”的真值：

① 0

② 1

③ 2

④ 不确定

查看完整题目与答案

随机题目

【单选题】 It is ten years ___ I left home.

① when

② after

③ since

④ as

查看完整题目与答案

【单选题】 With the popularity of smartphones, the micro blog __________ a good platform for the young to show themselves gradually.

① becomes

② has become

③ is becoming

④ became

查看完整题目与答案

【单选题】 ___ he is poor, he is well contented.

① although

② if

③ unless

④ while

查看完整题目与答案

【单选题】 It was ___ it rained heavily that they didn’t come.

① as

② because

③ for

④ since

查看完整题目与答案

【单选题】 1. We cant ___ one to change the habits of a lifetime in a short time.

① hope

② wait

③ expect

④ imagine

查看完整题目与答案

【单选题】 There were dirty marks on her trousers ___ she had wiped her hands.

① where

② which

③ when

④ that

查看完整题目与答案

【单选题】 EBay, Amazon and WalMart are popular websites ___ people can sell goods to each other.

① where

② which

③ when

④ whose

查看完整题目与答案

【单选题】 I hope ___ the little ___ I have been able to do has been of some use.

① that; that

② /; by which?

③ what; what

④ /; with which

查看完整题目与答案

【单选题】 The hours ___ the children spend in their one-way relationship withtelevision people undoubtedly affect their relationships with real-life people.

① when

② that

③ in which

④ on which

查看完整题目与答案

【判断题】 He has been in china for three years.

① 正确

② 错误

查看完整题目与答案