In the applet below, we have represented repeated independent Bernoulli trials by a single ball falling through an array of pins. Each time a ball falls onto a pin, it will bounce to the right (i.e. a success) with probability p or to the left (i.e. a failure) with probability 1-p. After the ball falls through the array, it lands in a bin labeled by the corresponding number of successes.
Click on a bin to see its corresponding total and probability. Alternatively, use the left and right arrow buttons to scroll through the bins. Also displayed is a confidence interval centered on the theoretical expected bin. Bins that are included in this confidence interval are highlighted in green.
* The name Plinko refers to a game played on The Price Is Right. However, the game show version is played on a rectangular array of pins instead of a triangular array. It would be more appropriate to call our applet Galton's board or a quincunx board; however this is far more difficult to pronounce.