Step 5 Objective

Find and justify probabilities based on equally likely outcomes in simple contexts.

Examples of what pupils should know and be able to do

Pupils should be able to mark on a number line the probability of a particular event exactly e.g. Pr(4) on a fair six-sided dice.

On a fair dice what is the probability of rolling:

  1. 5?
  2. an odd number?
  3. zero?
  4. a number greater than 2?
  5. a prime number?
  6. a number lying between 0 and 7?

Mark these probabilities on a probability scale.


Probing questions

Make up examples of equally likely outcomes with given probabilities e.g. 0.5, 1/6, 0.2, etc.

Justify your answers.

What if pupils find this a barrier?

Use suitably scaled number lines, e.g. for a 6-sided dice use a line divided into six equal parts.


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