An event that is sure to happen is:

certain — An event sure to happen is certain.

An event that cannot happen is:

impossible — An event that cannot happen is impossible.

Rolling a number from 1 to 6 on an ordinary dice is:

certain — A dice only shows 1 to 6, so this is certain.

JOMKELAS

Chapter 12

Probability

How likely events are — certain, likely, unlikely or impossible — and simple probability — with an interactive exercise.

Probability is how likely something is to happen.

We describe events as certain, likely, unlikely or impossible. A fair coin has 2 equal sides, so the chance of heads is 1 out of 2 = 0.5.

Remember

Certain = sure to happen · Impossible = cannot happen.
Probability = favourable outcomes ÷ total outcomes.

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