概率统计计算In a study of 85 third year students,it was found that 30 of them had a job (usually part time),33 had achieved a credit level in the previous year,and 23 had a job AND had achieved a credit level in the previous year.Using a contin

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概率统计计算In a study of 85 third year students,it was found that 30 of them had a job (usually part time),33 had achieved a credit level in the previous year,and 23 had a job AND had achieved a credit level in the previous year.Using a contin

概率统计计算In a study of 85 third year students,it was found that 30 of them had a job (usually part time),33 had achieved a credit level in the previous year,and 23 had a job AND had achieved a credit level in the previous year.Using a contin
概率统计计算
In a study of 85 third year students,it was found that 30 of them had a job (usually part time),33 had achieved a credit level in the previous year,and 23 had a job AND had achieved a credit level in the previous year.Using a contingency table or otherwise,answer the following questions.
Find the probability that a student,chosen at random from those who achieved credit level,had a job.

概率统计计算In a study of 85 third year students,it was found that 30 of them had a job (usually part time),33 had achieved a credit level in the previous year,and 23 had a job AND had achieved a credit level in the previous year.Using a contin
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

23/33

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