<PRE><B>Question 1141340</B>
&lt;br&gt;
That doesn&#39;t look like the expression for a Poisson process.&lt;br&gt;
I looked online and the expression I saw was&lt;br&gt;
{{{e^(-k)*(k^n/n!)}}}&lt;br&gt;
where k is a probability.&lt;br&gt;
Assuming the 0.8 you show is the probability, the expression seems that it should be&lt;br&gt;
{{{e^(-0.8)*(.8^3/3!)}}} = 0.03834 to 5 decimal places.&lt;br&gt;
Not the answer you say it is supposed to be....&lt;br&gt;
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To the reader....&lt;br&gt;
I only know what I found looking online; I have never studied Poisson processes.&lt;br&gt;
If you need more help with this problem, re-submit it with all the required information.</PRE>