median
don steward
mathematics teaching 10 ~ 16

Wednesday, 12 December 2012

greater odds

David Green undertook extensive projects in the UK, looking at student's understanding of probability concepts

these resources are based on one of the tasks he used

students can have interesting discussions, occasionally heated, about which jar has a better chance of a 'success' - these notions can be:
  • a misconception (same number of ... in each, or, more .... in this one)
  • based on good insights (if you double the number in A...)
  • created by an appreciation of ratio (there is one ... to one and a half....) 
  • equivalent fractions (maybe compared as decimal equivalents)                                                               














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