This tool allows you to create custom-specified random numbers,
such as the total on three dice.
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.
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. . . .
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?
Given the mean and standard deviation of a set of marks, what is
the greatest number of candidates who could have scored 100%?
Is the mean of the squares of two numbers greater than, or less
than, the square of their means?
Given a probability density function find the mean, median and mode
of the distribution.
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?
Choose any two numbers. Call them a and b. Work out the arithmetic mean and the geometric mean. Which is bigger? Repeat for other pairs of numbers. What do you notice?
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.