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1 . 中心极限定理是概率论中的一个重要结论.根据该定理,若随机变量
,则当
且
时,
可以由服从正态分布的随机变量
近似替代,且
的期望与方差分别与
的期望与方差近似相等.现投掷一枚质地均匀分布的骰子2500次,利用正态分布估算骰子向上的点数为偶数的次数少于1300的概率为______ .(保留小数点后四位)附:若随机变量
服从正态分布
,则
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a649bd2fccadc432792b19b362a24c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f491e9ac2b397ca730e6c42ce8acb13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ad63bb0a64b9199125a90126d6eb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcc248a7770a16fa10fc4602d71e0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d52a0d7ed4daf49155f454fc3dc60ad3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7761068ff270f6bde51274eab524f39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25786ac38a636ace234be9d0032bb8a8.png)
您最近一年使用:0次
2 . 已知随机变量
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476d09ce8d57e8fa4960e6437718061f.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7d9eed6b354586ffc456235edaa7d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f3ce75e100306866065699c5c1901e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476d09ce8d57e8fa4960e6437718061f.png)
您最近一年使用:0次
2018-10-08更新
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1185次组卷
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7卷引用:云南省保山市腾冲市第八中学2022-2023学年高二下学期期中考试数学试卷