Grass intake per bite by cows
This is an example data set for which an underlying normal population is a reasonable model — its histogram seems reasonably symmetric.
Drag the sliders to match the normal distn to the histogram as closely as possible.
(You could mention that most populations are not normal but are often approximately so, perhaps after a transformation.)
Also mention that normal distributions are more important as descriptions of sample means, proportions, ...
In an experiment that investigated the grazing behaviour of dairy cows, four cows were studied while they grazed on 48 different plots of grass. The grass intake was estimated in each plot by sampling before and after the experiment, and the number of bites made by each cow was recorded. The histogram shows the grass intake per bite in each of the plots.