1. Simple Experimental Probability

2. Experimental Probability =
Number of times the event occurs
Total number of outcomes
Simple Probability (experimental or theoretical) means one 1 outcome – 1 thing is happening.
Examples –
rolling a dice
choosing a card
choosing a color

3. Experimental Probability – results based on something you do – an experiment
Theoretical probability – based on possible outcomes and the sample space

4. Why aren’t they the same?
website

5. Examples

6. Martin has a bag of marbles
Martin has a bag of marbles. He removed one marble, recorded the color and then placed it back in the bag.
Based on his experiment, what is the probability of getting a red marble?
How many are red?
total possibilities
Remember probability = favorable outcomes – what you want
total number of possibilities

7. Martin has a bag of marbles
Martin has a bag of marbles. He removed one marble, recorded the color and then placed it back in the bag.
Based on his experiment, what is the probability of getting a blue marble?
How many are blue?
total possibilities
Remember probability = favorable outcomes – what you want
total number of possibilities

8. Martin has a bag of marbles
Martin has a bag of marbles. He removed one marble, recorded the color and then placed it back in the bag.
Based on his experiment, what is the probability of getting a green marble?
How many are green?
total possibilities
Remember probability = favorable outcomes – what you want
total number of possibilities

9. Martin has a bag of marbles
Martin has a bag of marbles. He removed one marble, recorded the color and then placed it back in the bag.
Based on his experiment, what is the probability of getting a yellow marble?
How many are yellow?
total possibilities
Remember probability = favorable outcomes – what you want
total number of possibilities

10. Martin has a bag of marbles
Martin has a bag of marbles. He removed one marble, recorded the color and then placed it back in the bag.
Based on his experiment, what is the probability of NOT getting a blue marble?
How many are NOT blue?
total possibilities
Remember probability = favorable outcomes – what you want
total number of possibilities

11. How many are NOT green or red?
Martin has a bag of marbles. He removed one marble, recorded the color and then placed it back in the bag.
Based on his experiment, what is the probability of NOT getting a green or red marble?
How many are NOT green or red?
total possibilities
Remember probability = favorable outcomes – what you want
total number of possibilities

12. Dree rolls a strike in 6 out of 10 frames of bowling
Dree rolls a strike in 6 out of 10 frames of bowling. What is the experimental probability that Dree will roll a strike in the first frame of the next game?

13. Dree rolls a strike in 6 out of 10 frames of bowling
Dree rolls a strike in 6 out of 10 frames of bowling. What is the experimental probability that Dree will roll a strike in the first frame of the next game?
Based on what he’s done so far – you can determine the probability of what may happen next.
What has he done so far? THAT is the probability………….

14. In soccer, Isabell scored 4 goals in her last 10 attempts
In soccer, Isabell scored 4 goals in her last 10 attempts. Find the probability of Isabell scoring a goal on her next attempt.
Remember probability = favorable outcomes – what you want
total number of possibilities

15. Favorite Music
Students
Rock 9
Country 5
Pop 2
Rap
Alternative 4
Based on the information in the table, what is the probability of a student choosing rap music?

16. Favorite Music
Students
Rock 9
Country 5
Pop 2
Rap
Alternative 4
Based on the information in the table, what is the probability of a student choosing rock music?

17. To play a game, you spin a spinner like the one shown
To play a game, you spin a spinner like the one shown. Lee played this game many times and recorded her results. She won 8 times and lost 40 times. Based on these results, what is the probability that she will win the next spin?

18. Jane played softball. In her last 10 games she hit the ball 8 times and missed 5 times. Based on this information, what is the probability that she will hit the ball next time?
Remember probability = favorable outcomes – what you want
total number of possibilities