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Year 1 · Statistics & Probability

Certain, likely, unlikely, impossible

Likelihood words describe chance: impossible, unlikely, likely, certain.

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  1. Certain: it must happen.
  2. Likely: more than half the outcomes.
  3. Unlikely: less than half the outcomes.
  4. Impossible: it cannot happen.

Worked example

3 red and 1 blue marble: picking red
3 of the 4 marbles are red: more than half
Likely

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If there are no blue marbles, picking blue is impossible, not unlikely.

Practise Certain, likely, unlikely, impossible properly

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