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M302 4/4/08  Notes
The probability of an event is written as “P(the event)”.
1. P(an event) = number of favorable outcomes / total number of outcomes
2. Odds In favor of an event = number of favorable outcomes / number of unfavorable outcomes
3. Odds against an event = number of unfavorable outcomes / number of favorable outcomes
Problem 3, pg 731
A) P(Spinner lands on red)
= 3 fav / 6 total = ½
B) P(Spinner lands on Yellow)
= 2/6 = 1/3
C) P(Spinner lands on Blue)
= 1/6
Problem 9, pg 730
Number of favorable outcomes = Number of tickets that Don bought
= 6.
Number of unfavorable outcomes = 51 total tickets – 6 that Don bought = 45
Odds against Don winning the iPod = 45 unfavorable outcomes / 6 favorable outcomes = 15/2 or
15:2
Chapter11 is about counting the number of options. We learned tree diagrams, product tables, slots, &
combinations!
In chapter 12, we will be finding mostly probabilities and a tiny bit of odds, BUT we have to be experts at
Ch.11 to do the harder problems in Ch.12.
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View Full DocumentProblem 40, pg 704 (HW #24)
8 Girls, 7 Boys = 15 people.
Order matters in performance. Use slots
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 Spring '08
 Irwin
 Probability

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