Answer to Question #28833 in Discrete Mathematics for Vernetta Marcellin
The formula to use is the formula of conditional probability:
P(A|B) = P(A and B) / P(B),
where P(A|B) is the probability of event A happening if condition B is satisfied,
P(A and B) -the probability of events A and B happening at the same time,
P(B) - the probability of condition B.
Thus in the terms of our problem A is "it rains" and B is "Susan has her umbrella".
Then P(A|B) = P(A and B) / P(B) = 0.56 / 0.62 = 0.903
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