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likelihood an event will occur written as a decimal, fraction, or percent


An activity involving chance that can have different results

experimental probability

the ratio of the number of times an event occurs over total number of trials


the different results of an experiment

theoretical probability

the ratio of number of ways the event CAN occur over total number of equally likely outcomes

complement of the event

all the ways the event did not turn out to be

sample space

all possible outcomes of an experiment

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