1. Summary of the Main Ideas
PROBABILITY
Summary of the Main Ideas

2. How to Find Probability
Number of Favorable Outcomes
_____________________________
Total Possible Outcomes
**Favorable = what you're looking for

3. Find the Probability of Each Event
Number of Favorable Outcomes
_____________________________
Total Possible Outcomes
**Favorable = what you're looking for

4. What is the probability of rolling a multiple of 3 on a six-sided number cube?2 _ 6 1 _ 3 =

5. What is an “event”?
ONE thing happens, like flipping a coin once, drawing one card, rolling one number cube, or choosing one soft drink.

6. Use the Spinner to Find the “probability” of each event
1/8

7. Use the Spinner to Find the “probability” of each event
P(prime)
4/8 = 1/2

8. Use the Spinner to Find the “probability” of each event
P(red)
1/8

9. Use the Spinner to Find the “probability” of each event
P(even)
4/8 = 1/2

10. Use the Spinner to Find the “probability” of each event
P(multiple of 3)
2/8 = 1/4

11. Use the Spinner to Find the “probability” of each event
P(not blue)
5/8

12. Use the Spinner to Find the “probability” of each event
P(not blue or yellow)
3/8

13. Complement
The complement of an event is the opposite of finding the “favorable” outcome. It is the set of all the other outcomes.

14. Lets Practice…...
Freddy Falcon has 6 tiles with the letters in his first name in a bag. What is the probability of reaching in and drawing a letter that is not a “d”
How many letters are in his first name?
2. How many “d”’s are in his first name? 6 2
3. How many letters are NOT “d”? 4 4
4. What should your favorable outcome be?
5. What is your TOTAL possible outcomes? 6

15. Lets Practice…...
Freddy Falcon has 6 tiles with the letters in his first name in a bag. What is the probability of reaching in and drawing a letter that is not a “d”
6. Write your probability fraction.
4/6
7. Simplify
2/3

16. Sample Space All Possible Outcomes
Let’s pretend that we going out to eat lunch. I must choose one entree’, one side, and one drink. Below are my options.
ENTREE’
SIDES
DRINK
Hamburger
Fries
Diet Coke
Cheeseburger
Onion Rings
Shake
Water

17. Sample Space What are my outcomes? ENTREE’ SIDES DRINK Hamburger (H)
Let’s pretend that we going out to eat lunch. I must choose one entree’, one side, and one drink. Below are my options.
What are my outcomes?
ENTREE’
SIDES
DRINK
Hamburger (H)
Fries (F)
Diet Coke (D)
Cheeseburger (C)
Onion Rings (O)
Shake (S)
Water (W)

18. Sample Space What are my outcomes?
Let’s pretend that we going out to eat lunch. I must choose one entree’, one side, and one drink. Below are my options.
What are my outcomes?
Let’s start with Hamburgers
List all of the possible outcomes
HFD
HFS
HOD
HOS
HOW
Now let’s list all the possible outcomes with Cheeseburgers
List all of the possible outcomes
CFD
CFS
CFW
COD
COS
COW

19. Sample Space What would my “sample space” be? 12 outcomes
Let’s pretend that we going out to eat lunch. I must choose one entree’, one side, and one drink. Below are my options.
What would my “sample space” be?
HFD
HFS
HOD
HOS
HOW
Easier…
How many entrees are there? 2
How many sides are there? 2
How many beverages are there? 3
CFD
CFS
CFW
COD
COS
COW
12 outcomes
Multiply the sample space: 2 x 2 x 3 = 12