Warm Up

There are 30 marbles in a bag. 10 are blue, 7 are red, 6 are yellow, and 7 are purple.

1) What is the probability of getting a red marble?

2) What is the probability of getting a yellow or a blue?

3) What is the probability of getting an orange?

ProbabilityMonday May 12th, 2014

Vocabulary to know… • Outcome• Sample Space• Event• Probability• Theoretical Probability• Complement• Odds

• Favorable Outcome• Experimental

Probability• Union• Intersection• Experiment• Survey

THEORETICAL PROBABILITY

Example

Complement

If the probability of you getting an A in this class is 78%, what is the probability that you do not get an A?

Example

Odds

Experimental Probability

Example

Example

Lesson Check

Lesson Check

The difference between….AND

• When you are asked to find the probability of Event 1 AND Event 2 happening, they both must occur.

This is called the INTERSECTION of two sets.

Operation: Multiplication

OR

• When you are asked to find the probability of Event 1 OR Event 2 happening only one, or both could occur.

This is called the UNION of two sets.

Operation: Addition

Notation: P ∩ Q Notation: P U Q

The difference between….AND OR

Notation: P ∩ Q Notation: P U Q

Example• List the sample space for rolling a dice• What about rolling two die?

• What is the probability of rolling an even number on the first AND a 2 on the second?

• What is the probability of rolling an even number on the first OR a 2 on the second?

Experimental vs. Theoretical

• Work on the Coin Flip Activity sheet with your partner.

• Answer the questions on the back.

Homework

Probability: Review &

Frequency

Tuesday May 13th, 2014

Warm UpComplete the half sheet!

Solutions

Solutions

Solutions

NC COMMON EXAM ?

Frequency

Example• What is the probability of

someone having 10-13 home runs?

• What is the probability of someone having 2-9 home runs?

Activity• Choose a question to ask at least 15 of

your classmates.• You must have at least 3 choices• Make a Frequency Table

Example: Do you prefer chocolate, vanilla, or strawberry ice cream?

Ice Cream Frequency

Chocolate 7

Vanilla 6

Strawberry 2

Activity• Now create two questions to go along

with your table following the guidelines below:

1) What is the probability of _____?

2) What is the probability of ______ or ______?

Ask your partner to answer the questions using your table! Ice Cream Frequency

Chocolate 7

Vanilla 6

Strawberry 2

Homework

• Worksheet