[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fBz1wdp4JDuHImD0ljrNsWe_Hzh0mtnOsu2EPLlufNF4":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-07-10 00:13:11",212643424,[8,9,10,11],"&sigma;^2\u002Fn","&sigma;^4\u002Fn","&sigma;^3\u002Fn","&sigma;^1\u002Fn",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},89,"cc0d92228e25f6cdfca0e787a60821df","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbb062ff6068e05b64e1dc4486da29b2a.jpg","概率论与数理统计","exam_167130466","期中考试(20251122)","设总体X服从正态分布N(u,&sigma;^2) ,X1,X2,X3,...,Xn 是它的一个样本,则样本均值A的方差是()",[21,32,41,50,59,68,77,84,93,101],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],212643406,[25,26,27,28],"0.09","0.05","0.9","0.5","设(X ,Y)的联合密度为 f(x,y)=4xy,0&le;x,y&le;1 0 ,其他 若F(x,y)为分布函数,则F(0.3,3)=()","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],212643408,[36,37,38,39],"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":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],212643410,[45,46,47,48],"正太","均匀","指数","泊松","当X服从( )分布时,EX = DX",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],212643412,[54,55,56,57],"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":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],212643414,[63,64,65,66],"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":69,"createTime":5,"id":70,"options":71,"question":76,"source":30,"type":31},[],212643416,[72,73,74,75],"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":78,"createTime":5,"id":79,"options":80,"question":83,"source":30,"type":31},[],212643418,[55,81,57,82],"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":85,"createTime":5,"id":86,"options":87,"question":92,"source":30,"type":31},[],212643420,[88,89,90,91],"1\u002F3","2\u002F3","1\u002F4","3\u002F4","设随机变量X~U(0,3),则P{1&le;X&lt;2}=()",{"answer":94,"createTime":5,"id":95,"options":96,"question":100,"source":30,"type":31},[],212643422,[97,98,99,57],"4","5","6","要使函数&Psi;(x)={ax\u002F(1+x)^4 x&gt;0, 0 x&le;0 }是某个随机变量的概率密度,则a=()",{"answer":102,"createTime":5,"id":6,"options":103,"question":19,"source":30,"type":31},[],[8,9,10,11]]