问题如下图:
选项:
A.
B.
C.
解释:
前面的60%不是increase的概率么,为什么要算joint probability呢,谢谢
NO.PZ2015120604000168问题如下You are builng mols for forecasting earnings per share of two construction companies, A anThe probability thCompany A's EPS will increase the enof yeis 0.45. The probability thCompany B's EPS will increase the enof yeis 0.25. The probability thtwo companies' EPS both increase is 0.10. Whis the probability thleast one of the two companies' EPS will increase accorng the forecasting mols? A.0.20 B.0.40 C.0.60 C is correct.The probability thleast one of the two companies' EPS will increase=0.45+0.25-0.10=0.60P(A)*1-P(B)+P(B)*1-P(B)+P(A B)=0.45*0.75+0.25*0.55+0.1=0.58
您好,我先用P(A)*P(B)=P(AB)做了初步判断,以为是inpennce关系,因此发现没有正确答案。这个判断等式,结果需要保留小数点多少才算与P(AB)的数值一致?
想问下这道题目,为什么是减去0.1,而不是加上0.1呢?因为感觉A和B两个同时发生,也是属于至少一个发生的范围里的吧?
这道题的考点是什么?题干的意思我不太明白
为什么要减去0.1了?不是问的2个公司中至少有一个公司EPS会增长的概率吗?不应该是0.45+0.25+0.10吗?