Example 1
X = 10, SD = 2, X = 11.7
n SD = 1         
n         
n .5000          .3023        .1977
n
n     ___________________________________________
n-3           -2            -1           0           1          2           3     z-scores
n     
n
n.85
nX = 11.7
nz = .85
np(X > 11.7) = .1977