Unit 3 Section 4 Simple Probability.notebook
January 07, 2016
Bellringer
Simplify each expression.
1.)
2.)
3.)
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Unit 3 Section 4 Simple Probability.notebook
January 07, 2016
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Unit 3 Section 4 Simple Probability.notebook
January 07, 2016
Simple Probability
Unit 3
Dec 13­12:24 PM
Vocabulary
Probability: the chance that a given event will occur.
Some areas where probability is used are sports,
weather, politics, and agriculture. Also when you
guess answers on a test or play games involving di or
enter a sweepstakes.
Dec 13­12:25 PM
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Unit 3 Section 4 Simple Probability.notebook
January 07, 2016
Event: Outcome or combination of outcomes
Outcomes: Possible results. Outcomes on a di are (1, 2, 3, 4, 5, 6)
Probability Formula:
Favorable Outcomes: the outcome that you are calculating the likelihood
of its occurrence.
Dec 13­12:27 PM
Example 1: Find each probability. Use the spinner.
a) P(2)
b) P(blue)
6
1
c) P(10)
2
5
d) P(blue,red, green)
4
3
Dec 13­12:30 PM
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Unit 3 Section 4 Simple Probability.notebook
January 07, 2016
Theoretical Probability: the calculation using the probability formula
that a favorable outcome will occur.
All Probability Ranges between 0 to 1. The probability of an
impossible event is always 0 and the probability of a certain even is
always 1.
Experimental Probability: what actually does happen in an experiment.
Dec 13­12:33 PM
Example 2: The hair color of students in class are as follows : 8
brown, 10 black, 2 red, and 3 blonde. If the teacher calls on one
student at random, what is the probability of calling on a student with
brown hair?
What is the probability that the teacher does not choose a student
with black hair?
Example 3: In a batch of 350 calculators, 7 were found to be defective.
What is the probability that a calculator chosen at random will be
defective? What the probability as a fraction and a percent. Round the
nearest tenth of a percent if necessary.
Dec 13­12:35 PM
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Unit 3 Section 4 Simple Probability.notebook
January 07, 2016
Example 4: Suppose two 1-6 number cubes are rolled. Find the
probability of each outcome. (Hint: Use the table below as your sample
space.)
(1, 1) (2, 1) (3, 1) (4, 1) (5, 1) (6, 1)
(1, 2) (2, 2) (3, 2) (4, 2) (5, 2) (6, 2)
(1, 3) (2, 3) (3, 3) (4, 3) (5, 3) (6, 3)
(1, 4) (2, 4) (3, 4) (4, 4) (5, 4) (6, 4)
(1, 5) (2, 5) (3, 5) (4, 5) (5, 5) (6, 5)
(1, 6) (2, 6) (3, 6) (4, 6) (5, 6) (6, 6)
a) P(2 or 6)
b) P(both even)
c) P(sum less than 7)
d) P(odd product)
Dec 27­9:14 PM
Odds
Odds in favor of event E = number of favorable outcomes
number of unfavorable outcomes
6
5
7 8
4 3
1
2
Use the spinner above. Find the odds in favor of each event.
Number > 3
Blue number
Red or Blue number
Even number
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Unit 3 Section 4 Simple Probability.notebook
January 07, 2016
Homework Packet pages 8 and 9
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