The applet continually flips the coin and updates the current proportion of flips that resulted in heads.
The Law of Large Numbers shows how the sample proportion of heads will converge to the true proportion (.5 in this case). People may be surprised at how different the sample proportion is when the number of trials is small.
Note: You can visit
https://www.greenfoot.org/scenarios/27567Â
to change the speed of the applet.