1. Sec. 4-5: Applying Ratios to Probability

2. Getting a “TAIL” with one flip of a coin
1. Outcome:
The result of a single trial of a probability experiment.
Getting a “TAIL” with one flip of a coin

3. 2. Event:
The “desired effect” of a probability experiment.
A “TAIL” or “HEAD” when flipping a coin.
Simple Events: Result of a single trial.
Compound Events: 2 or more simple events, like rolling an EVEN number on a die.

4. 3. Sample Space:
The SET of all possible outcomes of an experiment.
{Tails, Heads}

5. P(x) = “Desired outcome”
4. Probability: P(x)
Where x represents the event.
P(x) = “Desired outcome”
Sample Size
Theoretical Probability: uses SAMPLE SPACES to determine probability. (You do NOT have to actually DO an experiment)
P(“3”) = 1/6

6. Experimental Probability: An experiment must be done to determine the probability of an event. (Each outcome is considered to be equally likely.)
P(a cancer eliminating pill) = ???

7. 5. Complement:
The opposite (probability).
P(x) = 1 – P(x)
if P(x) = then P(x) = .6
if P(x) = 1/5 then P(x) = 4/5