Long description

Median of 15 values. The letters x subscript 1, x subscript 2 and so on, each with the subscripts in round brackets, are arranged in order, but in a V-shaped formation. At the top left-hand end of the V is x subscript 1. The letters then descend in order down the slope until they reach x subscript 8. Then they begin to rise up a slope to form the right-hand side of the V, starting with x subscript 9, which is level with x subscript 7. They continue upwards to end at x subscript 15, which is level with and to the far right of x subscript 1. Below the point of the V is a cloud containing the word ‘Median’. From the cloud an arrow points to x subscript 8.