Estimate the number of chillies in this picture:
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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.
Casio Classwiz CalculatorThere is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a highresolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app). As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols! This calculator has a highperformance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more... 
Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
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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.