Algebra 2

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Algebra 2 Ch.9 Notes Page 24 P24 9-7 Probability
of Multiple Events
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9-7 Probability of Multiple Events
Marbles - 2 Green 5 Red 3 Blue P (A and B) P(A)
x P(B)
Dependent events - One event affects the outcome
of a second event
P(G and R) Without Replacement
Independent Events - One event does not affect
the outcome of a second event
P(G and R) With Replacement
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Mutually Exclusive Events - Two events that
cannot happen at the same time. If A and B are
Mutually Exclusive, P (A and B) 0
Example Rolling an even number and a number
less than 2 on a 6 sided die.
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Probability of A or B
If A and B are mutually exclusive - P (A or B)
P(A) P(B) Standard Die P (3 or even) 1/6
1/2 4/6 2/3 If A and B are not mutually
exclusive - P (A or B) P(A) P(B) - P(A and
B) Standard Die P (3 or odd) 1/6 1/2 - 1/6
1/2
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HW 23 9-7 P534 1,2,5,6,9-11,14,15,18,19,24,25,
36-38 Please put your name and class period at
the top of the homework. Also include the
homework number.