Hi,

I need to clarify about normalizing formula.

Dr Andrew wrote that sigma^2 = 1/m * sum(x(i) ^ 2) and then X = X/sigma ^ 2.

But in clarification it is X = X/sigma.

So what is the right formula ?

Another thing is about sigma^2 formula it is 1/m * sum(x(i)^2) ot it is

1/m * sum(x(i) - mean)^2 ?