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A coin is flipped 5 times in a row. Each time it lands on either heads or tails. How many different results of the 5 flips are possible?
In how many of the above results does every flip result in a head?
Warm-Up: May 23, 2012
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Homework Questions?
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ProbabilitySection 12-3
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Any event has multiple outcomes. The desired outcome is called a success. Any other outcome is called a failure. Probability is the ratio of successes to total
outcomes. 0 ≤ P ≤ 1 When all outcomes are equally likely, we
say the outcomes occur at random.
Probability
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s = number of ways an event can succeed f = number of ways an event can fail
Probability Formula
outcomes possible of # total
outcomes successful of #
fs
sP
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What is the probability of rolling a sum of 7 with two dice?
Example 1
1/6
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When a coin is tossed five times, what is the probability that every flip comes up heads?
You-Try #1
1/32=0.03125
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Steve has a collection of 26 books – 16 are fiction, and 10 are nonfiction. He randomly chooses 8 books to take with him on vacation. What is the probability that he chooses 4 fiction and 4 nonfiction?
Example 2
0.24464
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Stanley (Mr. Szwast’s nephew) has a collection of 15 DVD’s – 11 are animated, and 4 are live-action. He randomly chooses 3 movies to take with him to his grandparents’ house. What is the probability that he chooses 2 animated movies and 1 live-action movie?
You-Try #2
44/91 = 0.48352
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The odds that an event will occur is the ratio of the number of successes to the number of failures.
Odds
f
sfsOdds :
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Find the odds of an event that has a 5/7 probability to occur.
Example 3
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Find the probability of an event that has 4:3 odds.
You-Try #3
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Page 648 #19-53 odd, 54
Assignment
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A Yahtzee is when five dice are rolled and all show the same number. What is the probability of rolling a Yahtzee on a single roll of the five dice? Express your answer as a percent rounded to three decimal places.
Warm-Up: May 24/25, 2012
0.077%
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Chapter 11 Test
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12-2 Worksheet due before you leave today 12-3 Worksheet due Tuesday
No school on Monday (Memorial Day)
Chapter 12 Worksheets