A variable x is normally distributed with mean 21 and standard deviation 4.
Round your answers to the nearest hundredth as needed.
a) Determine the z-score for x=28.
z=______
b) Determine the z-score for x=15.
z=_____
c) What value of xx has a z-score of 2?
x=______
d) What value of xx has a z-score of -0.5?
x=______
e) What value of xx has a z-score of 0?
x=_______