[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fmtBsVCLS_rUp6DuRF8IJJi-2Z1j15f1bxoBo3HvBKE8":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":16,"related":17,"source":27,"type":28},[],"2026-01-11 08:48:14",309163941,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd89bf6efe133652ae209eb3bbfb397c6.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe63ce294836549d8d93b5eaa1122a273.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0c0c627f9ffe4374353cb8526c483a41.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8e3fa1f33f1d04794540fc6e822a7ffc.png\">",{"courseId":13,"courseImg":14,"courseName":15},"ef095cb37a067242e015cf2132e10b96","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F077416ecbe2508a9820aaabff2470fe1.png","概率论与数理统计","设随机变量X服从参数为λ的指数分布,试求\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff8c9d0b1c4ac354d288cb3382b3a46db.png\">",[18,29,38,47,50,59,65,73,82,91],{"answer":19,"createTime":5,"id":20,"options":21,"question":26,"source":27,"type":28},[],309163938,[22,23,24,25],"8","16","28","44","设随机变量X,Y相互独立,且\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F776113130042004d202b5cca2e464532.png\">,则D(Z)=( )","v1",0,{"answer":30,"createTime":5,"id":31,"options":32,"question":37,"source":27,"type":28},[],309163939,[33,34,35,36],"0.2A","0.1A","10A","A","设10个电子管的寿命\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F356aa3dbec44b69536d583c17a9f3686.png\">独立同分布,且\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F964fc6027e3765600536ed7692fb23df.png\">,则10个电子管的平均寿命Y的方差D(Y)=_______",{"answer":39,"createTime":5,"id":40,"options":41,"question":46,"source":27,"type":28},[],309163940,[42,43,44,45],"-1","5","4","3","设随机变量\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F36c1fd32a4b316e7829cd3ce1ac3a9f8.png\">,且相互独立,则D(X-Y)等于( )",{"answer":48,"createTime":5,"id":6,"options":49,"question":16,"source":27,"type":28},[],[8,9,10,11],{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":27,"type":28},[],309163942,[54,55,56,57],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fff6de39e8282e26757ffa09bf0dfe0ec.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe83aa94113c4fda66904e24fb61c60e1.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3bc6129c6b5a287984617330b6e8a019.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe469764605fbe65fad80c00a4aa28b9c.png\">","随机变量X的分布律如下表,则D(X)=( ). \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4cc2a40ab9ebc901478c1e39e712476e.png\">",{"answer":60,"createTime":5,"id":61,"options":62,"question":64,"source":27,"type":28},[],309163943,[45,44,43,63],"7","设随机变量\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc9a86bdc61ddc5f371bea783a1063e4e.png\">,Y服从参数为3的泊松分布,且X与Y相互独立,则D(X+Y)=",{"answer":66,"createTime":5,"id":67,"options":68,"question":72,"source":27,"type":28},[],309163944,[69,70,44,71],"1","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd0e195d02601ffa7762316e2294d8139.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F806f9b59238976ae6cc47c9ee80b137e.png\">","设随机变量X的概率密度为\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6b2917dcb264b60d2e89df1bed9d1523.png\">,则D(3X+2)=( )",{"answer":74,"createTime":5,"id":75,"options":76,"question":81,"source":27,"type":28},[],309163945,[77,78,79,80],"0","X","D(X)","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa9287fc36a60d802c9e2c42fcb311e71.png\">","对任意随机变量X,若D(X)存在,则D[D(D(X))]等于( )",{"answer":83,"createTime":5,"id":84,"options":85,"question":90,"source":27,"type":28},[],309163946,[86,87,88,89],"D(X)>D(1-X)","D(X)<D(1-X)","D(X)=D(1-X)","D(X)+D(1-X)=1","设随机变量X的方差存在, D(X)>0,则以下结果正确的是",{"answer":92,"createTime":5,"id":93,"options":94,"question":97,"source":27,"type":98},[],309163947,[95,96],"正确","错误","随机变量的方差为描述变量取值偏离平均值的平均偏离程度",3]