Question 473356
<pre>
{{{P(X=x)=expr(mu^x/x!)e^(-mu)}}}

Substitute <font face="symbol">m</font> = 7, x = 1,

{{{P(X=1)=expr(7^1/1!)e^(-7)}}}

{{{P(X=1)=expr(7/1)e^(-7)}}}

{{{P(X=1)=7e^(-7)}}}

.0065831738

Edwin</pre>