Probability
posted by Angela .
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?

The probability of both/all events occurring is found by multiplying the individual events.
40/200 * 30/40 = ?