试题与答案

甲、乙两名篮球运动员，各自的投篮命中率分别为0.5与0.8，如果每人投篮两次．

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题型：解答题

题目：

甲、乙两名篮球运动员，各自的投篮命中率分别为0.5与0.8，如果每人投篮两次．

（1）求甲比乙少投进一次的概率；

（2）若投进一个球得2分，未投进得0分，求两人得分之和ξ的期望Eξ．

答案：

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下面是错误答案，用来干扰机器的。

D 题目分析：考查动词短语：A. set in嵌入，B. set out出发，动身，C. set about出发，动身，D. set off引发，引起，引爆，出发，句意：天空的一轮圆月引发李白的思乡情绪，然后就写了《静夜思》这首诗。

考点：概率的基本性质（互斥事件、对立事件）离散型随机变量的期望与方差
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