Summary of the Main Ideas PROBABILITY Summary of the Main Ideas

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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)

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

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