http://i48.tinypic.com/mtuk3n.jpg

Now I have:

E(N)=0.2

E(X)=500

V(N)=0.1998

V(X)=0

c=500

I can get the mean (100) and variance (49950) from those but the skewness I'm stuck. I even have the formula but my knowledge of moments is lacking.

http://i46.tinypic.com/j7uqdf.jpg

Thanks for your time.