1 . 给出下列说法:①“
”是“
”的充分不必要条件;②命题“
,
”的否定是“
,
”;③小赵、小钱、小孙、小李到4个景点旅游,每人只去一个景点,设事件
为“4个人去的景点不相同”,事件
为“小赵独自去一个景点”,则
;④设
,其正态分布密度曲线如图所示,那么向正方形
中随机投掷10000个点,则落入阴影部分的点的个数的估计值是6587.(注:若
,则
,
)其中正确说法的个数为
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465267358425088/2465540033363968/STEM/c5f7a9dd7c6443e4aea1db52dee89e5d.png?resizew=182)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6461468072bd27afd53fd5f9c3bf344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a46a6558b79c126968068088a48b73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6422b9c2e93a91fe9e39ce4d9dabb0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e389326a6fa207ab8c59a691e06b6b60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e3647b50eb753571192a5e0f5be63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d7c323819c9c951e7397d767bc9545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ba66e21bf50cdd44c2d033b537d63a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bffd5336cece9336edffaac3558ec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1290917c2c835b61384480b335cc1d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6cefb403ec6df1080a2bc76f17be074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba786fb43e28b87e263d37ecd70f9414.png)
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465267358425088/2465540033363968/STEM/c5f7a9dd7c6443e4aea1db52dee89e5d.png?resizew=182)
A.1 | B.2 | C.3 | D.4 |
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2卷引用:2020届宁夏中卫市高三下学期第二次模拟考试数学(理)试题
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2 . 已知甲在上班途中要经过两个路口,在第一个路口遇到红灯的概率为0.5,两个路口连续遇到红灯的概率为0.3,则甲在第一个路口遇到红灯的条件下,第二个路口遇到红灯的概率是
A.![]() | B.![]() | C.![]() | D.![]() |
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