Warm up What is the probability of choosing a red card from a standard deck of cards? What is the probability of choosing a king from a deck of cards? Given that a card is black, what is the probability that you choose a 4? 50% 8% 2/26 = 8%
Review HW
Probability Tables
A Little Vocabulary Athletics Music/Arts SGA Other Total Male Athletics Music/Arts SGA Other Total Male Male total Female Female total Athletics total Music/arts total SGA total Other total Table total
Joint Probability
Marginal Probability
Conditional Probability
Example 1 Using the table below, what is the joint probability of a female that is involved in SGA? 0/30 = 0% Athletics Music/Arts SGA Other Total Male 10 5 1 2 18 Female 6 12 15 11 3 30
Example 2 Using the table below, what is the marginal probability of choosing someone who is involved with athletics? 15/30 = 50% Athletics Music/Arts SGA Other Total Male 10 5 1 2 18 Female 6 12 15 11 3 30
Example 3 Using the table below, what is the conditional probability given that a person is male, that they are involved in Music/Arts? 5/18 = 28% Athletics Music/Arts SGA Other Total Male 10 5 1 2 18 Female 6 12 15 11 3 30
Task – Public Opinions
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