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单选题 设随机变量(X,Y)的分布律为: X/Y 0 1 2 0 3/28 9/28 3/28 1 3/14 3/14 0 1/28 0 0 则E(X-Y)=
学科：概率论与数理统计
时间：2024-06-17 00:52:29
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题目1单选题
设随机变量<img src="https://tihai-oss-cloud.itihey.com/img/e22a13f7edcffe98b7a922d3fe5be3b8.png">的概率密度为<img src="https://tihai-oss-cloud.itihey.com/img/c6a0c63a58ce58dd0344eb775dbe9c69.png">,则<img src="https://tihai-oss-cloud.itihey.com/img/8261fb39a0d629f01e40a77f07207cc5.png">____A. 1B. 2C. 3D. 4
题目2单选题
设随机变量X的概率密度为<img src="https://tihai-oss-cloud.itihey.com/img/01acf61c5c1807f59c1623c9a4fdaf52.png">,则E(2X-3Y)=A. 0.25B. 0.5C. 1D. 2
题目3单选题
设随机变量X的概率密度为<img src="https://tihai-oss-cloud.itihey.com/img/a13575a6aa13b5261ace8e80b6a34bf5.png">,则E(2X+5)=A. 1B. 2C. 5D. 7
题目4单选题
设随机变量(X,Y)的分布律为: X/Y 0 1 2 0 3/28 9/28 3/28 1 3/14 3/14 0 1/28 0 0 则E(X-Y)=A. -0.25B. 0C. 0.5D. 2
题目5单选题
设随机变量<img src="https://tihai-oss-cloud.itihey.com/img/b9f8e317c95ada80f5edc257a4ed55ec.png">,<img src="https://tihai-oss-cloud.itihey.com/img/6781b17cb9c3fe4ccd0013f90d1c6df5.png">,则<img src="https://tihai-oss-cloud.itihey.com/img/c4c80baaf20840fec1c5b671a6503381.png">的值为( )A. <img src="https://tihai-oss-cloud.itihey.com/img/326005cf559d5a6686d3307947807650.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/db2e5d3a74d97485543871a79f96c21f.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/87f108d00c4023b9573db219ca14962b.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/4ceabcbea03feb572af35bc5f9c7a135.png">
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