Intro to Probability
The region below is split into 4 color corners. You can change the proportion of each color by moving the white point of intersection.
The button "Randomize Point" will put a point, at random, within the region, with all points in the region being equally likely to be chosen. Points here do not exist on the black edges.
As random points are placed, a graph showing the percentage of points in each color region will be built and updated. Note that only 26 points (A thru Z) will physically plot, but the button will continue to "invisibly plot" about 100 total random points.