1. Review Question
Find the missing variable(s) for each of the problems

2. Review Question
Find the missing variable(s) for each of the problems

3. Review Question
Is line a parallel to line b? How do you know?
74˚
110˚ a b

4. Chapter 10 – Probability
10.0 Probability Notes

5. Entry Task Answer these questions in your group:
There are 20 marbles in a bag. Seven of them are blue. If you pull one marble out, do you think it is likely that it will be blue? Why or why not?
If you flip a coin 20 times, how many times would you expect it to be heads? Explain your answer.
Johnny flipped a coin 20 times. The flip was “heads” 15 times. Why do you think this happened?

6. Investigation: Flip a Coin
In your groups, flip the coin 20 times. Record H or T for each flip in a list. Once you’re done, answer these three questions:
What was your longest string of heads?
What was your 2nd-longest string of heads?
How many total heads did you flip?

7. Longest String
Sequence A
2nd – Longest string 1 2 3 4 5 6 7 8 9+

8. Number of heads 1: 10: 2: 11: 3: 12: 4: 13: 5: 14: 6: 15: 7: 16:
1: :
2: :
3: :
4: :
5: :
6: :
7: :
8: :
9: :

9. Probability
Probability – The likelihood of obtaining a certain outcome in a particular situation or during a particular event.

10. Experimental Probability
The probability based on the results of an experiment. Defined as the number of trials with the desired outcome divided by the total number of trials.
P(E) = # of occurrence of an event
Total number of trials

11. Theoretical Probability
The probability based on a mathematical analysis of all possible outcomes. Defined as the number of ways the desired outcome could occur divided by the total number of possible outcomes.
P(E) = # of different ways the event could occur
Total number of equally likely outcomes possible

12. Homework
10.0 Bookwork