Using Garlic As A Far-Transfer Problem of Proportional And Probabilistic   Reasoning
  The work describes a general problem, which emphasizes proportional reasoning and probabilistic reasoning skills in the context of planting garlic in a backyard garden. Along with practicing these reasoning skills in a context far-removed from the standard high school or college curriculum, our solution involves the development of a few relatively sophisticated statistical concepts, specifically histograms and confidence intervals. 
N.T. Moore and J.C. Deming