alleryStart learning →A probability of one for an event means the event is:
AImpossible to calculate
BGuaranteed to occur
CGuaranteed not to occur
DEqually likely either way
Answer & Solution
Correct answer: B. Guaranteed to occur
1. Probability runs on a scale from zero to one.
2. The two ends of that scale mean certainty in opposite directions.
3. A probability of one for some event indicates that it is guaranteed to occur, whereas a probability of zero indicates that it is guaranteed not to occur.
4. Halfway along the scale is where the two outcomes are equally likely.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 12 'Mendel's Experiments and Heredity', sections 12.1-12.3_
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