Statistic problem

The mean is u=15.2 and the standard deviation is o=0.9. Find the probablity that X is greater than 15.2.

Formula is z= x- mean divided by standard deviation or x-u divided by o

so i did 15.2 - 15.2 divided by 0.9 and got 0
but answer should be 0.5000, what am I doing wrong?

You got a z-score of zero. Now what number, from the table, corresponds to this?

(Or, which is simpler, just use what you [should] know about the mean.)