Show that the arithmetic mean, geometric mean and harmonic mean of a and b can be the lengths of the sides of a right-angles triangle if and only if a = bx^3, where x is the Golden Ratio.

Is the mean of the squares of two numbers greater than, or less than, the square of their means?

What is the relationship between the arithmetic, geometric and harmonic means of two numbers, the sides of a right angled triangle and the Golden Ratio?

Can you do a little mathematical detective work to figure out which number has been wiped out?

There are four unknown numbers. The mean of the first two numbers is 4, and the mean of the first three numbers is 9. The mean of all four numbers is 15. If one of the four numbers was 2, what were. . . .

Given the mean and standard deviation of a set of marks, what is the greatest number of candidates who could have scored 100%?

Given a probability density function find the mean, median and mode of the distribution.

Play around with sets of five numbers and see what you can discover about different types of average...

Edward Wallace based his A Level Statistics Project on The Mean Game. Each picks 2 numbers. The winner is the player who picks a number closest to the mean of all the numbers picked.

This tool allows you to create custom-specified random numbers, such as the total on three dice.

There are thirteen axes of rotational symmetry of a unit cube. Describe them all. What is the average length of the parts of the axes of symmetry which lie inside the cube?