A12­7CompoundEventsProbFall14.notebook
November 18, 2014
Algebra 1
Ch.2 Notes Page 63
P63 2­7 Probability of Compound Events
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A12­7CompoundEventsProbFall14.notebook
November 18, 2014
Probability of Independent Events
The result of one does not influence the result of the other.
If A and B are independent events, P(A and B) = P(A) x P(B)
Example: You roll a Red Number Cube and a Blue Number Cube. What is the probability that you will roll a 3 on the Red Cube and an Even on the Blue Cube.
Jan 10­11:39 AM
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A12­7CompoundEventsProbFall14.notebook
November 18, 2014
Probability of Independent Events
3 Blue
2 Red
5 Green
10 Total
Bag of Marbles
*With Replacement
P(Blue and Red)
Oct 14­2:57 PM
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A12­7CompoundEventsProbFall14.notebook
November 18, 2014
Probability of Independent Events
In a word game, you choose a tile at random from a bag containing the letter tiles shown. You replace the first tile and then choose again. What is the probability that you will choose an A and then an E?
15 Tiles
P(A and E)
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A12­7CompoundEventsProbFall14.notebook
November 18, 2014
Probability of Dependent Events
The result of one does influence the result of the other.
If A and B are dependent events,
P(A then B) = P(A) x P(B after A)
3 Blue
2 Red
5 Green
10 Total
Bag of Marbles
*Without Replacement
P(Blue then Red)
Oct 14­2:58 PM
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A12­7CompoundEventsProbFall14.notebook
November 18, 2014
Probability of Dependent Events
15 Tiles *Without Replacement
You take a tile at random from the tiles shown. Without replacing the tile, you select a second tile. What is the probability that you will choose an A and then an E?
P(A then E)
Jan 10­11:40 AM
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A12­7CompoundEventsProbFall14.notebook
November 18, 2014
Jan 10­11:39 AM
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A12­7CompoundEventsProbFall14.notebook
November 18, 2014
HW #71
2­6 P96 #1­27 Odds
2­7 P104 #1­21 Odds,29,31,33,35
Please put your name and class period at the top of the homework.
Also include the homework number.
Oct 14­2:21 PM
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