不是,是抽取10只,当且仅当4只的反应时间恰好是6.2s,（也就是说第三类恰好4只）这道题目是让你求条件概率.
题目大意：三类动物各15,13,12只,从中随机抽取10只,第三类动物恰好有4只,问在这种情况下第二类动物至少两只的概率.
概率论的题目 题意不清（英语）There are three types of animals in a laborat
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