Unformatted text preview: common - then P(A or B) = P(A) + P(B) b. If two events are NOT mutually exclusive, then P(A or B) = P(A) + P(B) - P(A and B) Rule 5 (Multiplication Rule): This is the probability that both events occur a. P(A and B) = P(A)*P(B|A) or P(B)*P(A|B) Note: this straight line symbol, |, does not mean divide! This symbols means "conditional" or "given". For instance P(A|B) means the probability that event A occurs given event B has occurred. b. If A and B are independent - neither event influences or affects the probability that the other event occurs - then P(A and B) = P(A)*P(B). This particular rule extends to more than two independent events. For example, P(A and B and C) = P(A)*P(B)*P(C) Rule 6 (Conditional Probability): P(A|B) = or P(B|A) =...
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- Spring '11
- Probability, Probability theory