Hey lpg0005.

To start you off if X is Normal with mean mu and variance sigma^2 then Z = [X - mu]/sigma where Z is Normal(0,1) and probability tables can be used to get probabilities for P(Z < z) for various values of z.

So if you want to find P(X < x) then remember that this is the same as finding P(Z < (x-mu)/sigma) where Z is Normal (0,1).