Probability Formulas The probability of more than one outcome. This is a union of the probabilities. If events are disjoint: If events are not disjoint:

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Presentation transcript:

Probability Formulas The probability of more than one outcome. This is a union of the probabilities. If events are disjoint: If events are not disjoint: Means the intersection of A and B. The number of items events A and B have in common.

Probability of more than one event. The probability of both A and B happening. If A and B are independent: If A and B are not independent: means the probability of B given that A has already happened.

Conditional Probabilities The probability of A given B. The probability of B given A. The intersection (overlap) of A and B divided by B. The intersection (overlap) of A and B divided by A.

Definition of Independent Events Events A and B are independent if either of the following are true: Practice #17 p – 35 odds, 41, 45