1. Terms to Know
Outcome: result of an action Event: A collection of possible outcomes Theoretical probability P(event)= number of favorable outcomes total number of possible outcomes

9. More words to Know
Complement: P(A’): the collection of outcomes not contained in the event. P(A’)= 1- P(A) Ex: P(not heads)= 1 - P(heads) Experimental Probability P(event)= number of times an event occurs total number of trials

10. Making predictions
I can use theoretical probability of an outcome to predict the number of times the outcome will occur in the future. I can use the experimental probability (relative frequency) of an outcome to predict the number of times the outcome will occur in the future.

11. More words to Know
Relative Frequency: how often something happens divided by all outcomes It’s another word for experimental probability!!

12. Example of relative frequency
We asked a class what kind of music the students like. 15 like pop music, 10 liked rock and roll, 4 liked hip hop or rap and 5 liked other kinds of music. Complete the table.
Items
Frequency
Relative frequency
Pop Music
Rock and roll
Hip-hop/rap
other

13. Example of relative frequency
We asked a class how many extra curricular activities they participate in. 15 said one, 10 said two, 5 said three, 1 said zero. Complete the table below.
Items
Frequency
Relative frequency 1 2 3

14. Examples
In the last hour a coffee shop sold twenty drinks including 8 lattes. If the shop sells ten drinks in the next hour predict how many will be lattes. Method 1 Method 2 Proportions Equivalent fractions

15. Examples
According to the game rules, the probability that a bottled-water cap can be redeemed for a prize is 1/24. If a store stocks 500 bottles of water, about how many winning caps are likely? Method 1 Method 2 Proportions Equivalent fractions

16. Your Turn
Suppose the probability that a bottle has a prize winning cap is only 1 out of 40. How many winning caps are likely among 500 bottles?

17. More examples
Kayla flipped a coin 50 times. She recorded her results in the table. Predict the number of times the coin will land heads up, based on past trials, if she flips the coin 25o times.
Side
Number of Outcomes
Relative frequency
Heads 30
Tails 20

18. More examples
Louis recorded the results of spinning a spinner 100 times. Next, he will spin the spinner 1,000 times. Predict the number of times the spinner will land on red. On green? On Yellow?
Color
Number of Outcomes
Relative frequency
Red 34
Yellow 20
Green 46

19. Question…
Brandon Phillips batting average is How many hits should we expect from him the next ten at bats?
Batting Average = total # of hits
total # of at bats