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List one thing that has a
probability of 0?
agenda
• 1) notes on probability
• 2) lesson 1
• example 1, 2
• Exercise 5-8
• Problem set 1-3
• 3)start lesson 3
Probability is a measure of how likely it is that
an event will happen.
A probability is a number between 0 and 1.
The probability scale is:
Probability Scale
0
Impossible
1/2
Unlikely
Equally Likely to
Occur or Not Occur
1
Likely
Certain
• Some events are impossible.
These events have a probability
of 0.
• There is no way to select a blue
cube if there are no blue cubes
in the bag.
• Some events are certain. These
events have a probability of 1.
• You will always get a green cube
if there are only green cubes in
the bag.
• Some events are classified as
• Flipping coin and landing on
equally likely to happen or to not
head or tail
happen. These events have a
1
probability of .
2
• Some events are more likely to
happen than to not happen.
• If you have a bag that contains
These events will have a
eight blue cubes and two red
probability that is greater than
cubes, and you select one at
0.5. These events could be
random, it is likely that you will
described as “likely” to occur.
get a blue cube.
• Some events are less likely to
happen than to not happen.
These events will have a
probability that is less than 0.5.
These events could be described
as “unlikely” to occur.
• If you have a bag that contains
eight blue cubes and two red
cubes, and you select one at
random, it is unlikely that you
will get a red cube.
• An outcome is the result of a single observation of an experiment.
• The sample space of an experiment is the set of all possible outcomes
of that experiment.
• The outcomes of an experiment are equally likely to occur when the
probability of each outcome is equal.
• Suppose a bag of crayons contains 10 green, 10 red, 10 yellow, 10
orange, and 10 purple pieces of crayons.
• If one crayon is selected from the bag and the color is noted, the
outcome is the color that will be chosen.
• The sample space will be the colors: green, red, yellow, orange, and
purple.
• Each color is equally likely to be selected because each color has the
same chance of being chosen.
Lesson 1
• example 1, 2
• Exercise 5-8
• Problem set 1-3
Exit ticket
• On the probability scale, what is the probability that tomorrow is
Tuesday?