Estimate the number of chillies in this picture:
Topics: Starter  Estimating
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Previous Day  This starter is for 7 February  Next Day
Here is a video that shows how statisticians use density samples to estimate their statistics.
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access to computers? 

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Students could collect everyone's estimates on a spreadsheet.
Use this data to calculate the median estimate. The student whose estimate is closest to the median wins a chilli.
Here is the URL which will take them to a different type of estimating activity.