Lesson Page
Uncertainty |
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Probability
is the chance that an event will happen. A number written as a
fraction can be used to describe probability.
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Probability |
= |
number
of ways the event happens |
| number
of ways all events can happen |
Example 1: The spinner has four
equally likely outcomes: 1,2,3,4.
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Probability
of landing on the number 4 |
1/4
Read: 1 out of 4 |
Example 2: The spinner has two
equally likely outcomes: blue and white.
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Probability
of landing on the color blue |
1/2
Read: 1 out of 2 |
| Remember:
|
List
all the outcomes possible. |
| Record
the probability as a fraction. |
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Oswego City School District
Elementary Test Prep
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