Question 1177161
<pre><font face = "consolas" color = "indigo" size = 3><b>
Hi
Poisson distribtion:
{{{p(x) = (mu^x/x!)*e^(-mu)}}}
{{{p(7) = (9^7/7!)*e^(-9)}}} = .1171

Or Using TI or similarly an inexpensive calculator like a Casio fx-115 ES plus 
P(7) = poissonpdf(mean, x-value) = poissonpdf(9, 7) = .1171

Wish You the Best in your Studies.
</font></b></pre>