Probability

Front

What is probability?

Back

Probability is the measure of how likely an event is to happen. It is expressed as a number between 0 (impossible) and 1 (certain).

Front

What does it mean if an event is 'certain'?

Back

An event is 'certain' if it will definitely happen. For example, if you flip a coin, it is certain that it will land on either heads or tails.

Front

What does it mean if an event is 'impossible'?

Back

An event is 'impossible' if it cannot happen at all. For example, rolling a 7 on a standard 6-sided die is impossible.

Front

What does 'likely' mean in probability?

Back

'Likely' means that an event has a good chance of happening, but it is not guaranteed.

Front

What does 'unlikely' mean in probability?

Back

'Unlikely' means that an event has a small chance of happening.

Front

What does 'equally likely' mean?

Back

'Equally likely' means that two or more outcomes have the same chance of happening.

Front

If a spinner has 4 equal sections, what is the probability of landing on any one section?

Back

The probability of landing on any one section is 1 out of 4, or 1/4.

Front

If there are 10 red marbles and 10 blue marbles, what is the probability of picking a red marble?

Back

The probability of picking a red marble is 10 out of 20, or 1/2.

Front

What is a spinner in probability?

Back

A spinner is a tool used in probability experiments that can land on different sections, each representing an outcome.

Front

What is a sample space?

Back

A sample space is the set of all possible outcomes of an experiment.