A12­6TheoreticalAndExperimentalProbFall14.notebook
November 18, 2014
Algebra 1
Ch.2 Notes Page 62
P62 2­6 Theoretical and Experimental Probability
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A12­6TheoreticalAndExperimentalProbFall14.notebook
November 18, 2014
Probability
What are the chances that some event will occur.
Probability (Event) = Favorable Outcomes
Total Outcomes
Example: Rolling an Even Number on a Number Cube
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A12­6TheoreticalAndExperimentalProbFall14.notebook
November 18, 2014
Theoretical Probability
What should happen if the experiment is done over and over again.
Favorable Outcomes
Total Outcomes
Tossing a coin.
(Should be 50% Heads and 50% Tails)
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A12­6TheoreticalAndExperimentalProbFall14.notebook
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Experimental Probability
What does happen when you do the experiment.
Number Favorable Outcomes
Total Experiments
(If you toss the coin 100 times, you might get 60 heads and 40 tails.)
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A12­6TheoreticalAndExperimentalProbFall14.notebook
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Complements
The Complement of an event is all of the outcomes not in the event.
The sum of the probabilities of an event and its complement is 1.
P(Not Event) = 1 ­ P(Event)
A Grand Prize is in one of 5 envelopes.
What is the chance of not picking the Grand Prize?
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A12­6TheoreticalAndExperimentalProbFall14.notebook
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Odds
Odds compares favorable and unfavorable outcomes...
Odds in Favor = Number of Favorable
Number of Unfavorable
Odds Against = Number of Unfavorable
Number of Favorable
Find the odds in favor of the spinner landing on a number greater than or equal to 6.
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A12­6TheoreticalAndExperimentalProbFall14.notebook
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Quality Control
A manufacturer has 8976 skateboards in its warehouse. If the probability that a skateboard has no defect is 99.2%, predict how many skateboards are likely to have no defects.
.992 x 8976 = 8904.2
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Notes Continued on Next Page...
Please put your name and class period at the top of the homework.
Also include the homework number.
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