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Additional Vocabulary Support
Experimental and Theoretical Probability
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Word or
Word Phrase
Definition
Picture or Example
probability
1. Probability is a numerical value
between 0 and 1 that measures
the likelihood of an event.
Actuaries use probability to
assess risk and make tables
for insurance companies.
experimental
probability
2. Experimental probability of
an event is a measure of the
likelihood that an event occurs
based on the actual results of an
experiment.
A team won 6 of their 10
games. The experimental
probability of the team
theoretical
probability
Theoretical probability of an event is
a measure of the likelihood that the
event occurs based on mathematical
reasoning.
3. Answers may vary.
Sample: The theoretical
probability of a penny
landing on heads is 12 .
outcome
4. An outcome is the possible result
of a situation or experiment.
One outcome of rolling a
number cube is rolling a 5.
event
5. An event is an outcome or a group
of outcomes.
A possible event of choosing
two cards from a deck is
a king of diamonds and a
2 of clubs.
sample space
The sample space is all possible
outcomes.
6. The sample space for
rolling one number
cube is {1, 2, 3, 4, 5, 6}.
complement of
an event
7. The complement of an event
consists of all possible outcomes in
the sample space that are not part
of the event.
The complement of rolling
an even number on a
number cube is {1, 3, 5}.
6
winning is 10 .
Prentice Hall Geometry • Teaching Resources
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