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The probability scale

Describing probabilities

We often make judgments as to whether an event will take place, and use words to describe how probable that event is. For example, we might say that it is likely that the sun will come up tomorrow, or that it is impossible to find somebody who is more than 3m tall.

The probability scale

Maths uses numbers to describe probabilities. Probabilities can be written as fractions, decimals or percentages. You can also use a probability scale, starting at 0 (impossible) and ending at 1 (certain).

Here are some events placed on the probability scale.

Probability scale

Now try to order the probabilities in the activity below.

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Activity

Probability activity

What are the chances of you trying this activity?

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