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A.![1570785370712239.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370712239.png)
B.![1570785370935088.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370935088.png)
C.![1570785370959329.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370959329.png)
D.![1570785370668643.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370668643.png)
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2一盒子内有10只球,其中6只是白球,4只是红球,从中取2只球,则取出产品中至少有一个是白球的概率为( )。
A.![1570785369376907.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369376907.png)
B.![1570785369627693.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369627693.png)
C.![1570785369961928.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369961928.png)
D.![1570785370187311.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370187311.png)
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3一盒子内有10只球,其中4只是白球,6只是红球,从中取三只球,则取的球都是白球的概率为( )。
A.![1570785369930742.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369930742.png)
B.![1570785369308568.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369308568.png)
C.![1570785369100794.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369100794.png)
D.![1570785369800810.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369800810.png)
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4从5个男生和4个女生中选出3个代表,求选出全是女生的概率( )。
A.![1570785369286503.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369286503.png)
B.![1570785369709276.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369709276.png)
C.![1570785369988904.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369988904.png)
D.![1570785369817250.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369817250.png)
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5任选一个不大于40正整数,则选出的数正好可以被7整除的概率为( )。
A.![1570785369451904.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369451904.png)
B.![1570785369807869.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369807869.png)
C.![1570785369368373.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369368373.png)
D.![1570785369393849.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785369393849.png)
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6甲、乙二人同时向一目标射击,甲、乙二人击中目标的概率分别为0.7和0.8,则甲、乙二人都击中目标的概率为( )。
A.0.75
B.0.56
C.0.5
D.0.1
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7设随机变量X的分布列为
![1570785370454864.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370454864.jpg)
则
![1570785370883496.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370883496.png)
( )。
A.0.1
B.0.2
C.0.3
D.0.4
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8设随机变量X的分布列为
![1570785370930863.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370930863.jpg)
则
![1570785370812309.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370812309.png)
( )。
A.0.4
B.0.5
C.0.6
D.0.7
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9设离散型随机变量ξ的分布列为
![1570785370787923.jpg](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370787923.jpg)
则ξ的数学期望( )。
A.![1570785370497963.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370497963.png)
B.![1570785370725122.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370725122.png)
C.![1570785370433179.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370433179.png)
D.![1570785370707180.png](https://www.changlipeixun.com/d/tiku/ueditor/image/20191011/1570785370707180.png)
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A.18
B.11
C.9
D.3
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