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填空题 随机变量X与Y相互独立且同分布,,,则 ____

学科：概率论与数理统计-城市231;储能231;储能232；/力学231;力学232’

时间：2024-10-10 08:45:59

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题目1
单选题
设事件{X=K}表示在n次独立重复试验中恰好成功K次,则称随机变量X服从( )
A. 两点分布B. 二项分布C. 泊松分布D. 均匀分布
题目2
单选题
设离散型随机变量<img src="https://tihai-oss-cloud.itihey.com/img/e22a13f7edcffe98b7a922d3fe5be3b8.png">的概率分布为<img src="https://tihai-oss-cloud.itihey.com/img/f7404b35ee7c51fb77a8f8ecd495eda0.png">,<img src="https://tihai-oss-cloud.itihey.com/img/0ed0ce773ec596c138f8d66855ad8f44.png">为<img src="https://tihai-oss-cloud.itihey.com/img/e22a13f7edcffe98b7a922d3fe5be3b8.png">的分布函数,则<img src="https://tihai-oss-cloud.itihey.com/img/4e34bbe4128c33c283cfc75cd42e5fe1.png">
A. 0.2B. 0.8C. 0.4D. 1
题目3
单选题
已知<img src="https://tihai-oss-cloud.itihey.com/img/8735f62e65f88be4309962b3734f6d74.png">件产品中有<img src="https://tihai-oss-cloud.itihey.com/img/b72b3ee8bd820b5477f6cec45c3aa972.png">件次品,从中任取<img src="https://tihai-oss-cloud.itihey.com/img/15d5be30deca51403b542ddff7718693.png">件,则至少取得<img src="https://tihai-oss-cloud.itihey.com/img/3c27f73673e9dac0bbbdd3acd2814bf8.png">件次品的概率为( )
A. <img src="https://tihai-oss-cloud.itihey.com/img/1424e3876bc2810357da5e47d531be2b.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/7f1afc4db00fe2738c6e12e20fa78310.png"> <img src="https://tihai-oss-cloud.itihey.com/img/e73c402a9aba7d3f10e50e1d33139f72.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/51aaf74a9c79596c8b930aa1c6532e23.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/67ad5d70cf8e6549220993312afb17ae.png">
题目4
填空题
<img src="https://tihai-oss-cloud.itihey.com/img/e51e84eb99d392e2d1c93c86d69d6ed4.png">,且<img src="https://tihai-oss-cloud.itihey.com/img/27dc4a0457c3519583ce4448a89c1fd3.png">,则<img src="https://tihai-oss-cloud.itihey.com/img/0f7bde4d73a9b74349d94371fbefcf9e.png">= ____
题目5
填空题
随机变量X与Y相互独立且同分布,<img src="https://tihai-oss-cloud.itihey.com/img/3856299a83952277b37c406421ae6aa7.png">,<img src="https://tihai-oss-cloud.itihey.com/img/2115bf94c7c89210cca2236d9e4a97b2.png">,则<img src="https://tihai-oss-cloud.itihey.com/img/a71794da4c9713fa2c9edc6fe24b2f67.png"> ____
题目6
填空题
设A、B为两个随机事件,P(A)=0.8,P(AB)=0.4,则P(A-B)=____
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