Let x = red blood cell (RBC) count in millions per cubic millimeter of whole blood. For healthy females, x has an approximately normal distribution with mean u = 4.7 and standard deviation o = 0.2. The Standard Normal Distribution (=0, = 1) z -3 -2 -1 0 | L 68% of area . i 95% of area 99.7% of area (a) Convert the x interval, 4.5