Probability

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Probability

• Created by
• Dallas Duffey
• Spring 2001

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likelihood
What is..
odds

• PROBABILITY

chance
possibility
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Probability is represented as the following ratio
P
of favorable outcomes
P R
of unfavorable outcomes

Total of outcomes
of favorable outcomes
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Compound Event
Two or more simple events.
Examples Simple Event Flipping a Coin
Compound Event Flipping a Coin,
then Rolling a die.
Simple Event Choosing a shirt to wear Compound
Event Choosing a shirt to wear
and then choosing pants to wear
Can you think of some examples?
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Probability Trees
Used to Organize Information
Helps us to determine the Probability of
different events, both simple and compound
Lets look at an example of a probability tree.
This probability tree represents all the possible
outcomes when a coin is flipped three times.
LETS TAKE A LOOK
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1st outcome
2nd outcome
Nth outcome
heads
heads
tails
heads
heads
tails
tails
heads
heads
tails
tails
heads
tails
tails
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• From this tree diagram find
• The total of outcomes
• The probability of getting 3 heads.
• The probability of getting 2 tails.
• The probability of getting tails then heads then
  heads.

Draw a tree diagram representing all the possible
outfits that Can be created from a red shirt,
blue shirt, and a black shirt. Black pants,
blue pants, khakis. And Black or tan shoes.