Conditional probability is the probability of some event, given the occurrence of another event. Conditional probability is often written as P (A l B) and is defined as the probability of A and B occurring together, divided by the probability of A. This concept is often used in scientific experiments.
Sample Problems (2)
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P(A and B) = ¼
P(B|A) = ⅔
I gave two tests. 90% of the class passed the first and 80% passed both.