Posted by **Angela** on Saturday, May 14, 2011 at 12:38pm.

A college professor has been studying the relationship between the attendance habits of his students and the grades they earn in his courses. A breakdown of 200 of his students revealed the following:

Attended regularly --- 160

Attended sometimes --- 40

Passed --- 170 and Failed --- 30

140 Passed and 20 Failed

30 Passed and 10 failed

Assume that a student is chosen at random. What is the probability that the student passes the course, given that the student attended class sometimes?

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