This problem offers you two ways to test reactions - use them to investigate your ideas about speeds of reaction.

Can you guess the colours of the 10 marbles in the bag? Can you develop an effective strategy for reaching 1000 points in the least number of rounds?

Use your skill and judgement to match the sets of random data.

Find the frequency distribution for ordinary English, and use it to help you crack the code.

Start with two numbers and generate a sequence where the next number is the mean of the last two numbers...

You may like to read the article on Morse code before attempting this question. Morse's letter analysis was done over 150 years ago, so might there be a better allocation of symbols today?

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