This power point explores frequency trees and how they work. I've created a number of exam-style questions and included plenty of opportunity for discussion.
Detailed notes included for teachers in the comments section of the ppt to help with explanations.
This lovely resource has been selected to feature in a forthcoming issue of the TES Secondary Maths Newsletter. which can be found on the TES Maths blog at http://www.tes.com/teaching-resources/blog/maths. Thank you so much for sharing, you are helping to inspire teachers and students all over the world! Craig Barton