问题补充：
单项选择题:
An analyst does research about joint probability and gathers the following information about a stocks dividend:Event 1 Probability of a dividend change 0.8 Event 2 Probability of a dividend increase 0.5 The joint probability that both events will occur is closest to:
A. 0.40 B. 0.50 C. 0.80
答案：
答案：B
解析:因为事件2股利上升已经包含在事件1股利变化之内，所以两者同时发生的联合概率就是股利上升的概率。
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