Conditional Probability Applied to the Weather Using a Tree Diagram The probability that it rains on a given day is 0.6. If it rains, the probability that a group of friends play football is 0.2. If it does not rain, the probability that they play football rises to 0.8. Using the notation P(A|B) read as "the probability of A given B" Compute the probability that the friends will play football on a given day