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With all outcomes equally likely, the probability of event A is found by counting outcomes in A and dividing by:
AThe number of events defined
BTotal outcomes in the space
COutcomes in event A again
DThe number of trials run
Answer & Solution
Correct answer: B. Total outcomes in the space
1. Equally likely outcomes make counting the whole calculation.
2. To calculate the probability of an event A when all outcomes in the sample space are equally likely, count the number of outcomes for event A.
3. Then divide by the total number of outcomes in the sample space.
4. Dividing by anything else would not give a number between zero and one.
_Source: OpenStax Introductory Statistics 2e (CC BY 4.0), Ch 3 'Probability Topics', sections 3.1-3.5_
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