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Home > Maths > Handling data > Probability

Probability scales

Probabilities can be shown on a scale between 0 (impossible) and 1 (certain).

It is certain (1) that the sun will rise tomorrow. There is an even chance (1/2) of getting 'tails' when you toss a coin. It is not likely (1/6) that you will get a 6 when rolling a dice. It's impossible (0) to roll an 8 on a dice.

For example, imagine a shopping bag contains three bananas and nothing else:

  • The probability of reaching into the bag and pulling out a banana is 1 (certain), as there is nothing else in the bag.

  • The probability of reaching into the bag and pulling out an apple is 0 (impossible), as there are no apples in the bag.

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