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. . . .
We use statistics to give ourselves an informed view on a subject of interest. This problem explores how to scale countries on a map to represent characteristics other than land area.
Given a probability density function find the mean, median and mode
of the distribution.
Your data is a set of positive numbers. What is the maximum value
that the standard deviation can take?
The probability that a passenger books a flight and does not turn
up is 0.05. For an aeroplane with 400 seats how many tickets can be
sold so that only 1% of flights are over-booked?
See how rotations, translations and glide reflections are all made up of compositions of reflections.
Go to last month's problems to see more solutions.
Given the products of diagonally opposite cells - can you complete this Sudoku?
A maths-based Football World Cup simulation for teachers and students to use.