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Probability and Sample Space Some terms you need to know: Experiment: an action that has measurable results Sample Space: the set of all possible outcomes of a particular experiment Event: any collection of possible outcomes of an Experiment Probability: if an experiment had n equally likely outcomes of which r outcomes are favorable to event A, then the probability r of event A is P( A) n Eg. Using a tree diagram, list the sample space of an experiment in which a coin is tossed and a 6-sided die is rolled. Determine the probability of tossing a tail and rolling a 2 m 1 1 1 Notice P(T ,2) 2 6 12 Determine the probability of tossing a tail and rolling a 4 or 2 1 2 1 Notice P(T ,2 or T ,4) 2 6 6 Probability Tree: using a tree diagram but instead of listing outcomes it uses probabilities Eg. According to blood records 4% of Canadians have type AB blood. Based on surveys, it is thought that 10% of the population is left handed. Assume there is no relationship between blood type and handedness. Determine P( L, AB) Eg. If three people in this group are chosen at random, what is the estimated probability that at least 2 of them have type AB blood? Pg. 371 #1-11,14