### Tree Tops

Can you make sense of information about trees in order to maximise the profits of a forestry company?

### Cricket Ratings

Like all sports rankings, the cricket ratings involve some maths. In this case, they use a mathematical technique known as exponential weighting. For those who want to know more, read on.

### History of Morse

This short article gives an outline of the origins of Morse code and its inventor and how the frequency of letters is reflected in the code they were given.

# Which List Is Which?

##### Age 14 to 16Challenge Level

Neeraj from Wilson's School noticed that sets A, D and E had more values greater than 70 than sets B, C and E.

Elliot from Wilson's School used the range:

I used the ranges of each set of data, to work out which sets go together. Alison's temperatures were more likely to have a greater range, whereas Charlie's data, on the weights of teenagers, is likely to have a small range. Therefore, I concluded that A, D and E, which have the largest ranges, were the temperatures, while B, C and F were the teenager's weights.

Randolph and Ethan, both from the USA, and Jelle from the Netherlands used another measure of spread, the standard deviation of each set:

The standard deviations for each set (to 3 decimal places) are:
A: 10.826
B: 4.527
C: 5.756
D: 9.520
E: 10.742
F: 5.229