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The probability of an event is the likelihood of it happening. Probabilities are between 0 and 1 and the higher the probability, the more likely the event is to occur. Probabilities can be given as decimals, fractions or percentages.

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  • For a fair dice, P(6) means the probability of rolling a 6.
  • For a bag of coloured balls, P(red) means the probability of a red ball being pulled out.
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  • The probability of something is always greater than or equal to 0, and less than or equal to 1.
  • Probabilities can be expressed as a decimal, fraction or percentage.
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Relative frequency

  • The relative frequency of an outcome during a probability experiment is an estimate of the probability of that outcome.
  • The more trials performed during the experiment, the more accurate the estimate.

Jump to other topics


1.1Place Value

1.2Factors & Multiples


1.4Fractions, Decimals & Percentages

1.5Growth & Decay

1.6Measurements & Units



3Ratio, Proportion & Rates of Change

4Geometry & Measures



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