1. Theoretical Probability
Math
Theoretical Probability

2. I CAN find the theoretical probability.
What Are You Learning?
I CAN find the theoretical probability.

3. Why Do You Need To Know This?
Theoretical Probability is useful in finding the number of outcomes for various real life situations.

4. Vocabulary
Outcome—one possible result of a probability event.
Simple event—one outcome or a collection of outcomes.

5. Vocabulary Theoretical Probability— number of favorable outcomes
number of possible outcomes
Outcomes occur at random if each outcome is equally likely to occur.

6. What is the Answer?
What is the probability of rolling an even number on a number cube marked with 1, 2, 3, 4, 5, and 6 on its faces?
P(even #) = even #s possible
total #s possible

7. A bag contains 7 blue, 5 purple, 12 red, and 6 orange marbles.
Find each probability if you draw one marble at random from the bag.
Write as a fraction in simplest form.
a. P(purple)
b. P(red or orange)
c. P(not blue)

8. 8th graders 25 7th graders 15 6th graders 10 P(not 7th grader)
The table shows the members of the Student Council. Suppose one student is randomly selected as the president. Find the probability of each event. Write as a fraction in simplest form.
8th graders 25
7th graders 15
6th graders 10
P(not 7th grader)
P(8th grader)
P(6th or 8th grader)
P(not 6th grader)
P(5th grader)