已知数集p事件A与B相互独立,P(A)=0....

人教A版数学选修2-3-2.2.2《事件的相互独立性(一)》ppt课件_百度文库
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你可能喜欢已知P(A)=0.7,P(B)=0.6,P(A-B)=0.3,求P(AB)为什么不能用P(AB)=P(A)+P(B)来求P=(AB)啊,求解啊??_百度知道
已知P(A)=0.7,P(B)=0.6,P(A-B)=0.3,求P(AB)为什么不能用P(AB)=P(A)+P(B)来求P=(AB)啊,求解啊??
提问者采纳
P(A-B)=P(A)-P(AB),所以P(AB)=0.4。因为AB可能不是相互独立的。举个例子,相互独立的例子你见过吧,假设两个人甲和乙射击比赛,甲射中概率0.7,乙射中概率0.6,两个人射击的场地是分开的,各自几枪射完就研究谁赢了,没有影响,那么就是独立的,也就是说甲乙都射中了的概率=0.7*0.6=0.42,没问题。那么什么是非独立呢?接着假设甲先射击,然后乙射击,但是如果甲射中了的话,乙的压力很大,所以射中概率就变小了,成了0.5,那么甲乙两人同时射中的概率就变成了0.7*0.5=0.35,很显然不等于P(A)*P(B)。注意一点,这里你不要以为乙后来的变化,变成0.5了,所以P(B)就要变,让他自己射击去照样还是0.6的概率,只是甲对他有了影响。所以这里不能直接计算P(AB)。
提问者评价
谢谢,刚刚学,还有些不懂
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>>>若事件A与事件B相互独立,则下列各式不正确的是()A.P(.A.B)=P(..
若事件A与事件B相互独立,则下列各式不正确的是(  )A.P(.A.B)=P(.A)+P(.B)B.P(.AB)=P(.A)P(B)C.P(A.B)=P(A)P(.B)D.P(AB)=P(A)P(B)
题型:单选题难度:偏易来源:不详
∵事件A与事件B相互独立,∴A与.B,.A与B及.A与.B也独立,∴P(.A.B)=P(.A)P(.B),P(.AB)=P(.A)P(B),P(A.B)=P(A)P(.B),P(AB)=P(A)P(B)考察四个选项知A格式不对故选A
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据魔方格专家权威分析,试题“若事件A与事件B相互独立,则下列各式不正确的是()A.P(.A.B)=P(..”主要考查你对&&概率的基本性质(互斥事件、对立事件)&&等考点的理解。关于这些考点的“档案”如下:
现在没空?点击收藏,以后再看。
因为篇幅有限,只列出部分考点,详细请访问。
概率的基本性质(互斥事件、对立事件)
互斥事件:
事件A和事件B不可能同时发生,这种不可能同时发生的两个事件叫做互斥事件。 如果A1,A2,…,An中任何两个都不可能同时发生,那么就说事件A1,A2,…An彼此互斥。
对立事件:
两个事件中必有一个发生的互斥事件叫做对立事件,事件A的对立事件记做。 注:两个对立事件必是互斥事件,但两个互斥事件不一定是对立事件。
事件A+B的意义及其计算公式:
(1)事件A+B:如果事件A,B中有一个发生发生。 (2)如果事件A,B互斥时,P(A+B)=P(A)+P(B),如果事件A1,A2,…An彼此互斥时,那么P(A1+A2+…+An)=P(A1)+P(A2)+…+P(An)。 (3)对立事件:P(A+)=P(A)+P()=1。 概率的几个基本性质:
(1)概率的取值范围:[0,1].(2)必然事件的概率为1.(3)不可能事件的概率为0.(4)互斥事件的概率的加法公式:如果事件A,B互斥时,P(A+B)=P(A)+P(B),如果事件A1,A2,…An彼此互斥时,那么P(A1+A2+…+An)=P(A1)+P(A2)+…+P(An)。 如果事件A,B对立事件,则P(A+B)=P(A)+P(B)=1。 互斥事件与对立事件的区别和联系:
互斥事件是不可能同时发生的两个事件,而对立事件除要求这两个事件不同时发生外,还要求二者之一必须有一个发生。因此,对立事件是互斥事件的特殊情况,而互斥事件未必是对立事件,即“互斥”是“对立”的必要但不充分条件,而“对立”则是“互斥”的充分但不必要条件。
发现相似题
与“若事件A与事件B相互独立,则下列各式不正确的是()A.P(.A.B)=P(..”考查相似的试题有:
826021862109524520396070812572457434设随机事件a.b.c相互独立。
设随机事件a.b.c相互独立。 10
设随机事件a.b.c相互独立。且Pa等于0.4,Pb等于0.5,Pc等于0.7,求abc恰有一个发生的概率,abc至少有一个发生的概率.
1&&&&&&& 0.4(1-0.5)(1-0.7)+0.5(1-0.4)(1-0.7)+0.7(1-0.4)(1-0.5)=0.36
2&&&& 1-(1-0.4)(1-0.5)(1-0.7)=0.91
提问者 的感言:谢谢,这是自考答案
其他回答 (2)
恰好有一个P=0.4*0.5*0.3+0.6*0.5*0.3+0.6*0.5*0.7=0.36
P(A并B并C)=P(A)+P(B)+P(C)-P(AB)-P(BC)-P(AC)+P(ABC)=0.91
恰有一个发生&& 0.4*0.5*0.3+0.6*0.5*0.3+0.4*0.5*0.7=0.29
至少一个发生 1-0.6*0.5*0.3=0.91
等待您来回答
数学领域专家若0&P(A)&1,则A,B相互独立的充分必要条件是P(B|A)=P(B|A的对立事件)。求证明~_百度知道
若0&P(A)&1,则A,B相互独立的充分必要条件是P(B|A)=P(B|A的对立事件)。求证明~
若0&P(A)&1,则A,B相互独立的充分必要条件是P(B|A)=P(B|A的对立事件)。求证明~
提问者采纳
P(AB)=P(A)P(B)
P(B︱A)=P(AB)/P(A)=P(B),P(B︱ )=P(B )/P( )=P(B)
P(B︱A)= P(B︱ ) ) P(B︱A)= P(B︱ ) P(AB)/P(A)= P(B )/P( ) P(AB) P( )/P(A)=P(B)—P(AB)
P(AB)=P(A)P(B)
提问者评价
采纳率100%
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