Probability Vocabulary

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Outcome

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A possible result of an experiment or trial, e.g., when rolling a die, all possible outcomes are 1, 2, 3, 4, 5, 6.

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Probability

Back

How likely something is to happen.

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Relative frequency

Back

The number of times an event happens divided by the total number of outcomes that took place in an experiment.

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Biased dice

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The probability of getting all the numbers will not be equal.

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Frequency

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How often an event occurs, e.g., you rolled 1, 6 times.

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Theoretical probability (expected)

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Describes how likely an event is to occur. Often called 'expected results'.

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Experimental Probability (observed)

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Actually completing the experiment and recording the frequency. Often called 'observe results'.

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Sample Space

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The collection of all possible outcomes. E.g., tossing a coin and rolling a dice: H1, H2, H3, H4, H5, H6, T1, T2, T3, T4, T5, T6.