A probability describes mathematically how likely it is that something will happen.
We can talk about the probability that it will rain tomorrow or the probability that England will win their next football match. We often use words like certain, likely, unlikely or impossible to describe the chance of something happening.
Look at the three events below. Decide which of the words certain, likely, unlikely or impossible best describes how likely each event is, then click on the button marked to see whether you are correct.
(a) Your maths teacher is older than you.
(b) Exeter City FC will win the next FA Cup.
(c) You obtain a seven when rolling a normal dice.
(d) It will rain somewhere in England during the next week.
The Probability Line
We can represent probabilities on a number line, as shown in the diagram below.
Look at the probability line below. The probabilities of the events A, B, and C have been marked on the line.
Look at the descriptions of three events below and match them up with the letters A, B and C on the line above
Once you have decided which letter matches with each event, click to see whether you are correct.
(a) You roll an unbiased dice and get an even number.
(b) Christmas Day is in the next twelve months.
(c) You pick a card from a normal pack of cards and get an ace.