Probability

interactivity
Red or black spinner

Age

3 to 16

Challenge level

A simple spinner that is equally likely to land on Red or Black. Useful if tossing a coin, dropping it, and rummaging about on the floor have lost their appeal. Needs a modern browser; if IE then at least version 9.
problem
Probably a code?

Age

16 to 18

Challenge level

Is the regularity shown in this encoded message noise or structure?
problem
Stage 5 cipher challenge

Age

16 to 18

Challenge level

Can you crack these very difficult challenge ciphers? How might you systematise the cracking of unknown ciphers?
problem
Which spinners?

Age

14 to 18

Challenge level

Can you work out which spinners were used to generate the frequency charts?
problem
Statistical shorts

Age

11 to 16

Challenge level

Can you decide whether these short statistical statements are always, sometimes or never true?
problem
Peas in a pod

Age

14 to 16

Challenge level

What is the chance this pea plant will look like its parents?
problem
All change

Age

5 to 7

Challenge level

There are three versions of this challenge. The idea is to change the colour of all the spots on the grid. Can you do it in fewer throws of the dice?
problem
Who's the winner?

Age

14 to 16

Challenge level

When two closely matched teams play each other, what is the most likely result?
problem
Distribution differences

Age

14 to 16

Challenge level

How could you compare different situation where something random happens ? What sort of things might be the same ? What might be different ?
problem
Drug testing

Age

16 to 18

Challenge level

How do different drug-testing regimes affect the risks and payoffs for an athlete who chooses to take drugs?