Poisson
Distribution Calculator
The calculator that you can find at the bottom of this page is an
online Poisson distribution calculator. It gives
the probability of an event occurring a given number of times. You must
know the expected frequency of the event.
We're just coding this formula:
probability = e^{[f + x ln(f)  ln(x!)]}
where
f = calculated frequency
x = test frequency
Example:
A
firmware is being embedded in a a lot of 2000
microcontrollers. The probability of any microcontroller failing
is 0.001 (just a conjecture and nothing to do with
reality, ok?) Then we can expect 2 microcontrollers will
suffer a severe problem
(2000 x 0.001 = 2). What is the probability that 4 micros will fail?
We use
our spreadsheet below and enter known data as input:
Enter calculated
frequency = 2
Enter
test frequency = 4
Our calculator answer
is
Probability
of 4
occurrences
= 0.09022
You'd have to enter the numbers like this...
Please
enable JavaScript codes, otherwise this tool won't work.


Reference:
Poole, L.; Borchers, M.; Some Common Basic Programs;
Osborne/McGrawHill;
3rd. edition; Berkeley, CA; 1979.
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