University of Illinois at Urbana-Champaign
Office for Mathematics, Science, and Technology Education
College of Education @ University of Illinois

Rocket Launch Probabiliity


This applet is designed to teach an application of probability. This java applet works by simulating a situation where a three stage rocket is about to be launched. In order for a successful launch to occur all three stages of the rocket must successfully pass their pre-takeoff tests. By default, each stage has a 50% chance of success, however, this can be altered by dragging the bar next to each stage. The launch button will become a reset button on a successful launch. Enjoy!


Inputs to adjust probability of success, and results of the most recent test for each stage.
Stage Probability of success Result
Contains the calculated success rate and the number of successful or failed launches
Success rate(%): 0.0000
Successful Launches: 0
Failed Launches: 0

Original Applet Source 1 & 2, Written by Nicholas Exner.

Converted to javascript by Daniel Hefner, 2016

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