Hi all,

Stuck on this question that we're supposed to do over summer, hope someone can help.

Attachment 24488

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- Aug 10th 2012, 04:23 PMjackmorgan3Discrete random variable, showing its a valid pdf
Hi all,

Stuck on this question that we're supposed to do over summer, hope someone can help.

Attachment 24488 - Aug 10th 2012, 04:42 PMPlatoRe: Discrete random variable, showing its a valid pdf
- Aug 11th 2012, 05:03 AMPlatoRe: Discrete random variable, showing its a valid pdf
**Please do not ask for additional in a PM.**Post what you need to ask within the thread.

$\displaystyle \sum\limits_{x = 0}^\infty {\frac{{{\lambda ^x}}}{{x!}}} = e^{\lambda}$

Thus $\displaystyle \sum\limits_{x = 0}^\infty {{e^{ - \lambda }}\frac{{{\lambda ^x}}}{{x!}}} = 1$. Why and what does that tell you?