The document provides tips and examples for calculating probabilities of simple and compound events. It explains that for simple probability the desired outcomes are divided by the total possible outcomes, and for compound probability the probabilities of each sequential event are multiplied. An example shows the probability of rolling a 5 or 6 on a standard 6-sided die is 1/3, and another demonstrates calculating the probability of choosing someone who likes vanilla ice cream and then someone who likes chocolate.

1. Tips
 #1 probability means
𝐷𝑒𝑠𝑖𝑟𝑒𝑑
𝑇𝑜𝑡𝑎𝑙
 #2 OR means addition
 #3 AND THEN means multiplication
 #4 If there are multiple events then you multiply

2. Simple Probability Example
 What is the probability of rolling a 5 or 6 on a dice?

3. Simple Probability Example
 What is the probability of rolling a 5 or 6 on a dice?
Desired = 1 + 1 = 2

4. Simple Probability Example
 What is the probability of rolling a 5 or 6 on a dice?
Desired = 1 + 1 = 2 Total = 6

5. Simple Probability Example
 What is the probability of rolling a 5 or 6 on a dice?
Desired = 1 + 1 = 2 Total = 6 2
6

6. Simple Probability Example
 What is the probability of rolling a 5 or 6 on a dice?
Desired = 1 + 1 = 2 Total = 6 2
6
Simplify =
1
3

7. Compound Probability Example
Ice Cream Flavors # of people
Strawberry 3
Vanilla 6
Chocolate 4
Sherbet 2
What’s the probability of choosing someone who likes vanilla and then choosing
someone who likes chocolate?

8. Compound Probability Example
Ice Cream Flavors # of people
Strawberry 3
Vanilla 6
Chocolate 4
Sherbet 2
What’s the probability of choosing someone who likes vanilla and then choosing
someone who likes chocolate?
First Event: Vanilla
6
15

9. Compound Probability Example
Ice Cream Flavors # of people
Strawberry 3
Vanilla 6
Chocolate 4
Sherbet 2
What’s the probability of choosing someone who likes vanilla and then choosing
someone who likes chocolate?
First Event: Vanilla
6
15
Second Event: Vanilla
4
15

10. Compound Probability Example
Ice Cream Flavors # of people
Strawberry 3
Vanilla 6
Chocolate 4
Sherbet 2
What’s the probability of choosing someone who likes vanilla and then choosing
someone who likes chocolate?
First Event: Vanilla
6
15
Second Event: Vanilla
4
15
6
15
x
4
15
=
24
225

11. Compound Probability Example
Ice Cream Flavors # of people
Strawberry 3
Vanilla 6
Chocolate 4
Sherbet 2
What’s the probability of choosing someone who likes vanilla and then choosing
someone who likes chocolate?
First Event: Vanilla
6
15
Second Event: Vanilla
4
15
6
15
x
4
15
=
24
225
Simplify by 3 =
8
75

12. Predictions Example
If I spin the spinner 360 times, how many times
would I land on an even number?

13. Predictions Example
If I spin the spinner 360 times, how many times
would I land on an even number?
Find the probability

14. Predictions Example
If I spin the spinner 360 times, how many times
would I land on an even number?
Find the probability
3
8

15. Predictions Example
If I spin the spinner 360 times, how many times
would I land on an even number?
Find the probability Make a proportion
3
8

16. Predictions Example
If I spin the spinner 360 times, how many times
would I land on an even number?
Find the probability Make a proportion
3
8
3
8
=
𝑋
360

17. Predictions Example
If I spin the spinner 360 times, how many times
would I land on an even number?
Find the probability Make a proportion
3
8
3
8
=
𝑋
360
Solve
X = 135 times