You may also like

Inspector Morse

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?

Reaction Timer

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

Bird Watch

Do you know which birds are regular visitors where you live?

Estimating Time

Age 11 to 14
Challenge Level

Does it make sense to use averages to see how close someone is to 10 seconds on average?

What else might you need to take into account?