Normal Distributions

For a normal random variable X with a mean of 12 and a standard deviation of 3, find a number x0 such that the following probabilities are obtained:

a) P(X <= x0) = 0.5
b) P(X >= x0) = 0.23

My solutions:
a) To normalize X, I did (x0-12)/3 = 0 because the Z-value for 0.5 is 0. Solving for x0, I got x0 = 12.
b) Since X>= x0, I wasn't sure if you could solve the problem the same way as in part a. How would I solve part b?

That is impossible. Did you type the question correctly?

edit: These are two separate questions I am guessing. In that case a) is correct. For b, find the closest z-score corresponding to an area of 0.77 (it will be positive).

a) Why on Earth are you Normalizing ANYTHING?! This is an eyeball problem. Don't you dare calculate anything to answer this one.

P(Something from a Normal Distribution) = 0.50? Pick the Mean.