Discrete random variable cumulative distrub. function

[jsmith613]

1. The problem statement, all variables and given/known data
http://s359.photobucket.com/albums/oo40/jsmith613/?action=view&current=MathQUUU.png


2. Relevant equations



3. The attempt at a solution
So I know that k = 1
But if F(>3) = 1 then why does F(3) also equal 1

Thanks

[verty]

What do you mean, why? It seems straightforward. Do you mean why as in, why does 1 = 1? Why does F(3) = 1? Or don't you think it is 1.

What do you think F(3) is or should be?