I was looking at an example of a NN but I dont understand in the Answer i where the .68 come from or .6637 enter image description here

This is the link of the tutorial


The tutorial states that each neuron uses the sigmoid activation function:

enter image description here

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

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