有工作的概率是30/85
有信用等级的概率是33/85
既有工作又有信用等级的是23/85
从有信用等级的人中,随机抽出一个有工作的概率是23/33
概率统计计算In a study of 85 third year students,it was found that
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It was 85 years还是 it has been 85 years?