# Thread: [SOLVED] Probability Models

1. ## [SOLVED] Probability Models

Please see below.

Can also just say to whoever is helping me out, you are pretty much awesome, and I will try and help others out as much as I can on this forum!

2. Found the answer to this by the way, here it is if your intersted

Discrete distribution taking only non-negative integer values

When a random variable takes only values in {0,1,2,3,...} we can use the following formula for computing its expectation:
Proof:
interchanging the order of summation, we have