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Probability is using numbers to tell a Chance or
likelihood that something will happen. Probability
is expressed as a number between 1 and 0.

Probability of 1 can be considered a certainty.
The probability that it will rain again one day is 1.

Probability of 0 means the event is impossible. The
Probability that you will live forever is 0.

Probability can be fractions, decimals or percents.
Probability
An event with a probability of .5 can be considered
to have equal odds of occurring or not occurring.
Probability
This can be written as .5, 50% or 1/2
What is the probability that the spinner shown
below will land on red.
Example:
probability spinner
Answer P(Red) =
as a fraction 1/4

as a percent 25%

as a decimal .25