Probability
UK Secondary (7-11)
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Sample Spaces
Lesson

In probability, the sample space is a list of all the possible outcomes of an experiment.

Outcomes are the results of an experiment. For example, think about flipping a coin. There are two possible outcomes - a head or a tail. So when we list (or write out) the sample space, we'd write:

{$\text{heads, tails}$heads, tails}

There are some common items used in probability questions, including cards, dice, coins so it's good to be familiar with their characteristics.

Handy Facts
  • There are $52$52 cards in a standard deck.
  • A standard die has $6$6 faces (because it's a cube)
  • A coin has $2$2 faces- heads and tails

 

Examples

Question 1

A jar is filled with $4$4 blue marbles and $3$3 red marbles and one is to be chosen at random. List the sample space.

Think: What are all the possible options for what marble will be selected?

Do: {$\text{blue, red}$blue, red}

 

Question 2

The spinner below is spun.

List the sample space.

Think: What are all the possible outcomes?

Do: {$\text{yellow, green, red, blue}$yellow, green, red, blue}

 

Question 3

A standard six-sided die is rolled.

  1. List the sample space.

    (Separate outcomes with a comma)

  2. List the sample space for rolling a number strictly less than $3$3. Separate outcomes with a comma.

  3. List the sample space for rolling a number divisible by $3$3. Separate outcomes with a comma.

  4. List the sample space for rolling an even number. Separate outcomes with a comma.

 

 

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