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When every outcome is equally likely, the theoretical probability of an event is which ratio?
ASample size over event size
BEvent size over trial count
CEvent size over sample size
DTrial count over event size
Answer & Solution
Correct answer: C. Event size over sample size
1. Theoretical probability can only be used when all outcomes are equally likely.
2. It is the ratio between the number of outcomes in the event set and the number in the sample space.
3. The event set is always part of the sample space, so this ratio never exceeds one.
4. Turning the ratio upside down would give values above one, which no probability can take.
_Source: Siyavula Mathematics Grade 10 (Everything Maths, CC BY 4.0), Chapter 14: Probability_
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