Basic Probability


probability is a measure of how likely it is that an event will happen.

Key Skills

  • use the correct words when talking about probabilities.
  • calculate probabilities for events such as rolling dice and tossing coins.
  • find the expected value when carrying out several trials e.g. how many heads do you expect to get on 10 tosses of a coin.


probabilityexperimenttrialoutcomesample spaceeventequally likely outcomes, relative frequency.