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9-7 Independent and Dependent Events (pg. 398-401) Indicator: D7 • Compound event- 2 (or more) simple events • Independent events – The outcome of the first event does not effect the outcome of the next event. P(A&B)= P(A)•P(B) Example: P (rolling “5” and tails)= 1 1 1 6 2 12 Dependent Events- the outcome of one of the events affects the outcomes of another event. P(A & B)=P(A)• P(B following A) Example: P (queen and 3)= 4 4 16 52 51 2652 4 or 0.6% 663 You Try 1) Tossing 4 coins and getting heads on all four? 2) There are 10 country CD’s and 15 rock CD’s. What is the probability of drawing a rock then a country CD? • Mutually Exclusive events: Can not happen at the same time P(A or B) = P(A) + P(B) 2 1 1 P(2 or 3 on a dice)= 6 6 6 or 1 3 Homework • Period 3--> 9- 7 page 400-401 #1719 & 22-32 all