Posted by Ray on .
On tuesday you all took the science and then your social studies final exams. What is the probability of you passing your social studies final exam given that you know that you passed your science final exam first ? The probability of you passing both is 50% and the probability of you passing the first 80%

Math 
PsyDAG,
The probability of all/both events occurring is found by multiplying the probabilities of the individual events.
.8 * x = .5