Artificial Neural Network Example Problem I was looking at an example of a NN but I dont understand in the Answer i where the .68 come from or .6637 

This is the link of the tutorial
The tutorial states that each neuron uses the sigmoid activation function:



That funciton is:
$$
\sigma(x) = \frac{1}{1+ e^{-x}}
$$
so just substitute $x = 0.755$ into that to get 0.68026719669.