Probability of compound events.notebook
May 28, 2013
Warm­ups:
Jacob has 10 rap, 18 rock, 8 country, and 4 pop CDs. Two are selected at random. Find each.
1. P(2 pop)
2. P(1 rap and 1 rock)
3. Odds( 2 country)
1
Probability of compound events.notebook
May 28, 2013
Section 13.4: Probability of Compound Events
P(A and B) = P(A)P(B)
With or Without replacement
Ex: With replacement
P(Spade and facecard)
Ex: Without replacement
A bag contains 3 brown, 4 red, and 6 green marbles.
You randomly select three.
P(Choose all brown)
2
Probability of compound events.notebook
May 28, 2013
P(A or B) = P(A) + P(B) ­ P(A and B)
P(Red or spade)
P(Red or Queen)
AT LEAST
6 children ( 4 girls and 2 boys)
4 kids are chosen at random
P(at least 3 girls)
3