9-79-7 Independent and Independent and Dependent EventsDependent Events (pg. 398-401)

Indicator: D7

• Compound event-Compound event- 2 (or more) simple events

• Independent 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:Example: P (rolling “5” and tails)=

21

61

121

Dependent Events-Dependent Events- the outcome of one of the events affects the outcomes of another event. P(A & B)=P(A)• P(B following A)ExampleExample:P (queen and 3)=

or 0.6%

514

524

265216

6634

You TryYou 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 eventsMutually Exclusive events: Can not happen at the same time

P(A oror B) = P(A) + P(B)

P(2 or 3 on a dice)= 61

61

62

31

or

Homework

• Period 3--> 9- 7 page 400-401 #17-19 & 22-32 all