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Centre for Research in Mathematics Education (CRME)
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Sampling and estimating how many jellybeans
This is a problem solving lesson, designed to help you assess how well students are able to:
- Model a situation mathematically, justifying any assumptions made.
- Estimate unknown values/missing information when solving a problem.
- Calculate volumes of three-dimensional objects.
- Use an appropriate sampling method to draw conclusions about a population.
The problem is set in the context of a game at a fair that involves guessing how many jellybeans there are in a jar. Students are given a picture of a jar, together with its dimensions. They must make suitable estimates of other quantities. The problem is to estimate the total number of jellybeans, and the number of black jellybeans.
This is a problem solving lesson from the Mathematics Assessment Resource Service, a collaboration between UC Berkeley and the Shell Centre team at the University of Nottingham. Further information on the collection is given here.
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