2014年电子科技大学857概率论与数理统计考研真题.pdf

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第 1 页 共 3 页 电子科技大学 2014年攻读硕士学位研究生入学考试试题 考试科目:857概率论与数理统计 注:所有答案必须写在答题纸上,写在试卷或草稿纸上均无效。 一、 填空题(每题3分,共15分) 1、 甲乙两人各自独立的向同一目标重复射击两次,甲每次命中目标的概率为 ( )01pp=,则( )min,PXY m 等于( ) (A) 2a (B) 1 2a (C) a (D) 1 a 第 2 页 共 3 页 2、设 12,nXXXL 是来自总体 ( )2,XNms 的简单随机样本,其均值为X,如果 PXaPXbmm= 的点A的最大似然估计。(已知 ( )1.6450.95=) 6、某地区对50至60岁男性公民进行调查,结果发现肺癌病人和无肺癌者吸烟比例差不多,分别为99.7%和95.8%,于是有人说吸烟对是否患肺癌没有太大的影响,若假定肺癌发病率为0.01%,你怎么评价这种说法?

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