Watch and decide if the following statements are True or False. 1. When there is an emergency, Dr. Philips always discusses the case with his colleagues.
A.
正确
B.
错误
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参考答案:
举一反三
【单选题】据统计,某地区一年中下雨(记作事件 A )的概率是 ,刮风(三级以上的风)(记作事件 B )的概率是 ,既刮风又下雨的概率是 .则下列各式正确的是( )
A.
这是事件 A , B 的积的概率,即既刮风又下雨的概率.
B.
这是在刮风的条件下,下雨的条件概率,用条件概率的计算公式: 可得正确结果.
C.
这是在下雨的条件下,刮风的条件概率,用条件概率的计算公式: 可得正确结果.
D.
这是事件之和的概率,由概率加法公式 P ( A + B )= P ( A )+ P ( B )- P ( AB ) =
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