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Intuitive Addition Rule. To find P(A or B), find the sum of the __________ event A can occur and the number of ways event B can occur, adding in such a way that ____________ is counted only ______. P(A or B) is equal to that sum, divided by the total number of outcomes in the sample space.

Intuitive Addition Rule. To find P(A or B), find the sum of the __________ event A can occur and the number of ways event B can occur, adding in such a way that ____________ is counted only ______. P(A or B) is equal to that sum, divided by the total number of outcomes in the sample space.

 Describe the sample space of the procedure of deciding to take a single class

P (A or B) = P(A) + P(B) P(A and B) also known as Formal Addition Rule: where P (A and B) denotes the probability that A and B ____ occur at the _______ as an outcome in a trial of a procedure.

 Describe the sample space of the procedure of deciding to take a single class

Event A: Randomly select a female student Event B: Randomly select a veteran Because a female student ___ ___be a veteran, so the events are __________

Event A: Randomly select a female student Event B: Randomly select a veteran Because a female student ___ ___be a veteran, so the events are __________

If you know that there is an 87% chance of winning a game. Find P(A) and P(A’).  Small Hint

If you know that there is an 87% chance of winning a game. Find P(A) and P(A’).  Small Hint

1250 United States adults were surveyed and 228 of them were smokers. Find the Probability of getting a smoker? What is the probability of not getting a smoker. P (smoker) = __ and P (not smoker) =