刘同学2018-12-10 08:02:24
刘同学15.单选题 收藏 标记 纠错 The manager of a pension fund determines that during the past five years 85 percent of the stocks in the portfolio have paid a dividend and 40 percent of the stocks have announced a stock split. If 95 percent of the stocks have paid a dividend and/or announced a stock split, the joint probability of a stock paying a dividend and announcing a stock split is closest to:
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张玮杰2018-12-10 09:33:46
张玮杰同学你好，你的问题是啥，哪里不明白？
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这道题怎么算！
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同学你好，这题里面，股票分红和股票分拆两个事件，就是P(A)和P(B)，分别是85%和40%，然后题目求的是联合概率P(AB)，公式就是P(A or B)=P(A)+P(B)-P(AB)，讲义里讲过的，题目讲了95%的概率会发生分红或分拆，那么现在P(A or B)=95%，带到公式里去求就好了
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