数据5,7,7,8,10,11的标准差是 .
考点分析:
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甲、乙两人约定上午7:00至8:00之间到某站乘公共汽车,在这段时间内有2班公共汽车,它们开车的时刻分别是7:30和8:00,甲、乙两人约定,见车就乘,则甲、乙同乘一车的概率为(假定甲、乙两人到达车站的时刻是互相不牵连的,且每人在7时到8时的任何时刻到达车站是等可能的)( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411014_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411014_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411014_ST/2.png)
D.
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如图所示,直线AB的方程为6x-3y-4=0,向边长为2的正方形内随机地投飞镖,飞镖都能投入正方形内,且投到每个点的可能性相等,则飞镖落在阴影部分(三角形ABC的内部)的概率是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411013_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411013_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411013_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411013_ST/2.png)
D.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411012_ST/images0.png)
如图所示的算法流程图中(注:“A=1”也可写成“A:=1”或“A←1”,均表示赋值语句),第3个输出的数是( )
A.1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411012_ST/0.png)
C.2
D.
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抛掷两个骰子,则两个骰子点数之和不大于4的概率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411011_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411011_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411011_ST/2.png)
D.
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由一组样本数据(x
1,y
1),(x
2,y
2),(x
3,y
3)…(x
n,y
n)得到的回归直线方程
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411010_ST/0.png)
,那么,下面说法不正确的是( )
A.直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411010_ST/1.png)
必经过点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411010_ST/2.png)
;
B.直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411010_ST/3.png)
至少经过(x
1,y
1),(x
2,y
2),(x
3,y
3)…(x
n,y
n)中的一个点;
C.直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411010_ST/4.png)
的斜率为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411010_ST/5.png)
;
D.直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411010_ST/6.png)
和各点(x
1,y
1),(x
2,y
2),(x
3,y
3)…(x
n,y
n)的偏差
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225948411641144/SYS201311012259484116411010_ST/7.png)
是坐标平面上的所有直线与这些点的偏差中最小值
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