1. Quick Start Expectations
Fill in planner and HWRS HW: WDYE p #9-10, 24-25
Get a signature on HWRS
On desk: journal, toolkit, packet, calculator, HWRS, bin
Warm Up: On your VOCABULARY TOOLKIT, record the definitions (pg. 12) for:
Probability
experimental probability
Trial
favorable outcome

2. p. 12
Vocab toolkit

4. Probability Probability: Mathematical term for chance.
Experimental Probability:
A probability found by conducting an experiment and collecting data. What actually happens. Requires action!
Favorable Outcomes:
Trials in which the desired results occur
Notation:
We write probability as P(heads) =
“The probability of the coin landing on heads is…”
Relative Frequency:
Ratio of number of desired results over the total number of trials
Sample Space:
The set of all possible outcomes
Example: If the experiment is tossing a coin, the sample space is the set {H,T}.
Vocab toolkit

5. Probability Continued…
In Monday’s experiment we tossed a coin. Suppose the coin landed on heads 7 out of the 10 trials.
Express this outcome using mathematical notation
P(head) = 7 10
- Notice we wrote…
total # of trials
P(event) = favorable outcome

8. P (match) =
P (no match) =

9. P (match) = P (no match) = B. Whole Class Findings:
Group No
Match
B. Whole Class Findings:
1. What are the experimental probabilities for the combined data?
P (match) =
P (no match) =
2. Do you think a match and a no-match have the same chance of occurring as your group data? Explain:

10. 2 ways - HH and TT 2 ways - HT and TH
Yes, a match and a no match are equally likely

11. Kalvin’s results better predict the experimental probability of the thumbtack landing on its head because more tosses should lead to a better prediction.

12. HW: WDYE p #9-10, 24-25