[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fA1GX-mn6Qkch1yu9pw3NpTgsI9uMYRXU6pQzZxHjyGU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":18,"related":19,"source":29,"type":30},[],"2025-07-01 10:21:34",210226077,[8,9,10,11],"正太","均匀","指数","泊松",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":16},39,"cc0d92228e25f6cdfca0e787a60821df","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbb062ff6068e05b64e1dc4486da29b2a.jpg","概率论与数理统计","exam_166345115","当X服从( )分布时,EX = DX",[20,31,40,43,52,61,70,77,86,94],{"answer":21,"createTime":5,"id":22,"options":23,"question":28,"source":29,"type":30},[],210226075,[24,25,26,27],"0.09","0.05","0.9","0.5","设(X ,Y)的联合密度为 f(x,y)=4xy,0≤x,y≤1 0 ,其他 若F(x,y)为分布函数,则F(0.3,3)=()","v1",0,{"answer":32,"createTime":5,"id":33,"options":34,"question":39,"source":29,"type":30},[],210226076,[35,36,37,38],"3\u002F8","5\u002F7","5\u002F6","4\u002F5","设p(A)=1\u002F3,p(B)=1\u002F2,分别在p(AB)=1\u002F8.的条件下求P(B`A)为()",{"answer":41,"createTime":5,"id":6,"options":42,"question":18,"source":29,"type":30},[],[8,9,10,11],{"answer":44,"createTime":5,"id":45,"options":46,"question":51,"source":29,"type":30},[],210226078,[47,48,49,50],"1","2","0.98","3","甲、乙两人单独地解答同一道习题,甲能答对的概率是0.8,乙能答对的概率是0.9. 试求:至少有一个人答对的概率为()",{"answer":53,"createTime":5,"id":54,"options":55,"question":60,"source":29,"type":30},[],210226079,[56,57,58,59],"H0不真,接受H0","H0为真,拒绝H0","H0不真,拒绝H0","H0为真,接受H0","在假设检验中,Ho表示原假设,H1表示备择假设,则称为犯第二类错误的是( )",{"answer":62,"createTime":5,"id":63,"options":64,"question":69,"source":29,"type":30},[],210226080,[65,66,67,68],"0.1813","0.1547","0.2323","0.2","假设某种热水器首次发生故障的时间X(单位:小时)服从指数分布Exp(0.002),求:该热水器在100小时内需要维修的概率是()",{"answer":71,"createTime":5,"id":72,"options":73,"question":76,"source":29,"type":30},[],210226081,[48,74,50,75],"2.5","3.5","某公共汽车站每隔5分钟有一辆车通过,可将车站上侯车的乘客全部运走. 设乘客在两趟车之间的任何时刻到站都是等可能的,乘客侯车时间不超过3分钟的概率和乘客平均候车时间为()",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":29,"type":30},[],210226082,[81,82,83,84],"1\u002F3","2\u002F3","1\u002F4","3\u002F4","设随机变量X~U(0,3),则P{1≤X<2}=()",{"answer":87,"createTime":5,"id":88,"options":89,"question":93,"source":29,"type":30},[],210226084,[90,91,92,50],"4","5","6","要使函数Ψ(x)={ax\u002F(1+x)^4 x>0, 0 x≤0 }是某个随机变量的概率密度,则a=()",{"answer":95,"createTime":5,"id":96,"options":97,"question":102,"source":29,"type":30},[],210226086,[98,99,100,101],"σ^2\u002Fn","σ^4\u002Fn","σ^3\u002Fn","σ^1\u002Fn","设总体X服从正态分布N(u,σ^2) ,X1,X2,X3,...,Xn 是它的一个样本,则样本均值A的方差是()"]