To view this page, you should have the most recent Java installed
32-bit JRE (Java Runtime Environment) 1.8.0_20.
This Applet will run online in your browser, but it is a hybrid you
can also download, install and run it on your own machine as standalone
application. It will start and run faster if you do that. It will also
work safely even if you have disabled Java in your browser.
This Applet, on the surface is very simple. It calculates your odds of getting N heads
in a row tossing a coin. It also works when the coin is weighted. The same math also
applies to anything you repeat over and over with the same odds. For example, what are
you odds of escaping nuclear war for 80 years given the odds of escaping it one year.
What are your odds of avoiding an earthquake for 90 years given the odds of having an
earthquake in a given year. Using the probability enformation in the HIV Safe Sex tables, It can compute your odds of
getting AIDS (Acquired Immuno-Deficiency Syndrome) given what you do and how
often you do it.
The Myth Of the Golden Coin
Mankind does a number of things that amount to what the people in this mythical
kingdom do. Every year the people gather and toss a large golden coin. The coin is
heavily weighed to come up heads. If it comes up heads all is well for yet another year.
However, if it ever comes up tails, the people explode all their nuclear weapons, release
all their biotoxins and nerve gases, and their secret weapons and kill everyone. You can
use the Applet below to see roughtly how long this civilisation lasts given how weighted
the coin is.
How to Use the Applet
Mathematician talk of probabilities rather than odds. If a coin every single time came
up heads without fail because it was designed to, we would say it came up heads with
probablity 1. If it came up tails every single time, we would
call that probability 0. If it came up heads helf the time (a
true coin), we would call that propability .5. If the coin came
up heads ¾, then we would call than probability
.75. Let’s say you entered .75
in the box labelled probability then entered 50 which
means you are interested in the odds of getting 50 heads. The
Applet will calculate a graph, showing you the odds of getting heads once, twice …
all the way up to 50 times. You see the plunging toward 0 as the number of trials
increases. It is realitively easy to get short strings of heads with a weighted coin, but
even with that advantage, the effect of even one failing toss ruins the odds.
Let’s do a nuclear power accident. Throwing heads
means running the plant for a whole year without it melting down. The odds are pretty
good of doing this. You can estimate them by counting the number of nuclear plants, the
total number of plant-years they have operated, and the total number of meltdowns. To do
the calculation for a single plant, compute the odds of a good year as (1 - probability of plant having an accident in a given year). Put that in
the probability slot in the Applet. Then pick a number of trials, say 90 years (the projected lifespan of some child you care about). You can
handle an accident or terrorist attack that detonates nukes, releases biowarfare,
releases chemical weapons, a really nasty industrial accident, earthquake similarly.
The formula this program uses r = pt only applies
when the trials are independent, i.e. knowing the outcome of one trial does not give you
a way to predict the next. For example, you could not use it on cicada populations since
they have a regular seventeen year pattern. You could not use it for earthquakes which
have a rough cycle and aftershocks.
Java Requirements and Troubleshooting
is a signed Java Applet (that can also be run as an application)
to GoldenCoin Probability Calculator.
You are welcome to install it on your own website.
If it does not work…
For this Applet hybrid to work, you must click grant/accept/always run on this site/I accept the risk
to give it permission to allow variable look and feel.
If you refuse to grant permission, the program may crash with an inscrutable stack dump
on the console complaining about AccessController.checkPermission.
In the Java Control Panel security tab,
click Start ⇒ Control Panel ⇒
Programs ⇒ Java ⇒ Security, configure medium security
to allow self-signed and vanilla unsigned applets to run.
If medium is not available, or if Java security is blocking you from running the program,
configure high security
and add http://mindprod.com
to the Exception Site List at the bottom of the security tab.
Often problems can be fixed simply by clicking the reload button on your browser.
Make sure the Java in your browser is enabled in the security tab of the Java Control panel.
Click Start ⇒ Control Panel ⇒
Programs ⇒ Java ⇒ Security ⇒
Enable Java Content in the browser.
This signed Java Applet (that can also be run as an application)
needs 32-bit or 64-bit Java 1.7 or later.
For best results use the latest 1.8.0_20 Java.
It works under any operating system that supports Java
e.g. W2K, XP, W2003, Vista, W2008, W7-32, W7-64, W8-32, W8-64, W2012, Linux, LinuxARM, LinuxX86, LinuxX64, Ubuntu, Solaris, SolarisSPARC, SolarisSPARC64, SolarisX86, SolarisX64 and OSX
You should see the Applet hybrid above looking much like this
If you don’t, the following hints should help you get it working:
If the above Applet hybrid appears to freeze-up, click
Alt-Esc repeatedly to check for any buried permission dialog box.
If you have certificate troubles,
check the installed certificates
and remove or update any obsolete or suspected defective certificates.
The only certificate used by this program is mindprodcert2014dsa.cer.
Especially if this Applet hybrid has worked before, try clearing the browser cache and rebooting.
To ensure your Java is up to date, check with Wassup.
First, download it and run it as an application independent of your browser,
then run it online as an Applet to add the complication of your browser.
If the above Applet hybrid does not work,
check the Java console for error messages.
If the above Applet hybrid does not work, you might have better luck with the downloadable version available below.
If you are using Mac OS X and would like an improved Look and Feel,
download the QuaQua look & feel
UnZip the contained quaqua.jar
and install it in ~/Library/Java/Extensions
or one of the other ext dirs.
Click the Information bar, and then click Allow blocked content. Unfortunately, this also allows dangerous ActiveX code to run. However, you must do this in order to get access to perfectly-safe Java Applets running in a sandbox. This is part of Microsoft’s war on Java.
Try upgrading to a more recent version of your browser,
or try a different browser e.g. Chrome, Firefox, SeaMonkey, Opera, Safari or Avant.
If you still can’t get the program working
click the red HELP button below for more detail.
If you can’t get the above Applet hybrid working
after trying the advice above and from the red HELP button below,
have bugs to report or ideas to improve the program or its documentation,
please send me an email at.
When I went to UBC (University of British Columbia),
I specialised in propability
and statistics. There are so many astounding things you learn that the general public
never hears about. One of the first things you learn is the way things that are highly
improbable become inevitable if you risk them often enough. Humans tend to grossly
underestimate the long term effects of repeating a risky behaviour (such as having unsafe
sex or maintaining arsenals of nuclear or biological weapons or building nuclear
reactors). I hope this non-emotional, mathematical approach will let people discover for
themselves how risky much of mankind’s behaviour is.
for the current version of GoldenCoin. Computes probability including odds or thrown heads N times in a row.
zip for GoldenCoin Java source, compiled class files, jar and documentation to run on your own machine either as an application or an Applet.
Runs on any OS that supports Java e.g. W2K, XP, W2003, Vista, W2008, W7-32, W7-64, W8-32, W8-64, W2012, Linux, LinuxARM, LinuxX86, LinuxX64, Ubuntu, Solaris, SolarisSPARC, SolarisSPARC64, SolarisX86, SolarisX64 and OSX.
GoldenCoin is free. Full source included.
You may even include the source code, modified or unmodified
in free/commercial open source/proprietary programs that you write and distribute. Non-military use only.