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Year 7 · Statistics & Probability

Probability of a single event

Probability is how likely something is, written as a fraction from 0 (impossible) to 1 (certain).

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How to do it

  1. Count the outcomes you want.
  2. Count all the possible outcomes.
  3. Write want over all, and simplify.

Worked example

2 red, 3 blue and 1 green: the chance of blue
3 blue out of 6 marbles
3/6 = 1/2

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The total is all the marbles, not just the other colour.

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