AS/A2 Stats 2 Stats 3

S1 Topic 3: Probability
Combining probabilities
Given two events A and B, the additional rule for probabilities is written as: P(AÈB) = P(A) + P(B) - P(AÇB) the multiplication rule for probabilities is written as: P(AÇB) = P(A|B) × P(B)

Two events A and B have these probabilities: P(A) = 0.2, P(B) = 0.6, P(AÇB) = 0.1

Two mutually exclusive events A and B have these probabilities: P(A) = 0.4, P(B) = 0.5

Two events A and B have these probabilities: P(A|B) = 0.4, P(B) = 0.3

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