Let X = Red Blood Cell (RBC) Count in Millions $\mu$

Multiple Choice

Let x = red blood cell (RBC) count in millions per cubic millimeter of whole blood. Suppose for healthy females, x has an approximately normal distribution with mean $\mu$ = 4.3 and standard deviation $\sigma$ = 0.8 Convert the following x interval from a laboratory test to a z interval. 1.1 > x

A) -4 > z
B) 1 < z
C) -4 < z
D) 2 < z
E) 4 < z