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In basic probability, what is the probability of an event that is certain to occur?
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4. Probability
Basic Concepts of Probability
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Which statement best describes probability in the context of basic probability theory?
A
A count of how many times an event occurs, which must always be an integer greater than or equal to .
B
A guarantee that a random event will occur as long as it has been observed at least once in the past.
C
A measure of the average size of outcomes in a sample, expressed in the same units as the data.
D
A numerical measure between and that quantifies the likelihood of an event occurring, with meaning impossible and meaning certain.
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Understand that probability is a numerical measure that quantifies how likely an event is to occur.
Recall that probability values range between 0 and 1, where 0 means the event cannot happen and 1 means the event is certain to happen.
Recognize that probability is not a count of occurrences, but rather a measure of likelihood.
Note that probability does not guarantee an event will happen just because it has happened before; it only expresses the chance of occurrence.
Conclude that the best description of probability is: a numerical measure between 0 and 1 that quantifies the likelihood of an event occurring.
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