lecture+7+fall+2011

# lecture+7+fall+2011 - Welcome to the Jungle Click to edit...

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Click to edit Master subtitle style 9/23/11 Welcome to the Jungle! http:// www.ebaumsworld.com/audio/play/820440/

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9/23/11 We often use capital letters (and sometimes indices) to talk about an event. Example, “A” might be the event we get a head on the flip of a coin. We use this notation because it is more efficient than writing “Heads.” We often use “P” to indicate a probability function. Example, “P(A)” would be the probability of getting a head on the flip of a coin. We use “P” and letters because they are more efficient than writing “Probability of Heads.” P(A|B): conditional probability of A knowing that B already occurred P(A or B) = P(A U B) = probability of the union P(AB) = P(A and B) = P(A ∩ B): joint probability Some Notation
9/23/11 Multiplication rule of counting: If there are m ways a first event can occur and n ways a second event can occur, the total number of ways the two events can occur is given by m x n . Example:

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lecture+7+fall+2011 - Welcome to the Jungle Click to edit...

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