Student classify
There are 10 students to take part an exam consists of 3 good students, 4 fair students, 3 average students. In the 20 questions, good students answer all, fair students answer 16 questions, average students answer 10 questions. Get a random student and give this student four questions, this student answers all of these four questions. Calculate the probability this student is fair student.
The answer is 0.324.
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