How likely something is to happen.
Many events can't be predicted with total certainty. The best we can say is how likely they are to happen, using the idea of probability.
Tossing a Coin
When a coin is tossed, there are two possible outcomes:
• heads (H) or
• tails (T)
We say that the probability of the coin landing H is ½.
And the probability of the coin landing T is ½.