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Year 8 · Statistics & Probability

Probability of two independent events

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

What is the probability that a die shows more than 4 and then a die shows more than 4?
The events are independent, so multiply: 1/3 × 1/3 = 1/9 = 1/9.
Answer: 1/9

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