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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?
ProbabilityUnit 8
Vocabulary to know…
• Outcome
• Sample Space
• Event
• Probability
• Theoretical Probability
• Complement
• Odds
• Favorable Outcome
• Experimental
Probability
• Union
• Intersection
• Experiment
• Survey
Theoretical vs.
Experimental Activity
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 die!
• 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?
• What is the probability of rolling a 5 on the first AND a 1 on the second?
Homework
• Worksheet
Do Now
Complete the half sheet!
Probability: Review
& Frequency
Thursday December 11th, 2014
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?
What is the probability that a student is 5ft tall?
What is the probability that a student is 6ft tall?
2 Way Frequency Table
Example
Relative Frequency
You try!
NC Common Exam
Homework
• Two-Way Frequency Table Worksheet