There is vitamin A (but no vitamin Z .. just the mineral Zinc).
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-1.13 < z < 1.65
A z-score gives the distance (specifically number of standard deviations) from the mean so when you compare z-scores, it gives a direct comparison of how far from the mean the values are.
That depends on the values of 'z', 'y', and 'x'.
Yes, they do exist.
-0.772 < Z < 0.772