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 μ = 4.8 and standard deviation σ = 0.3 (based on information from Diagnostic Tests with Nursing Implications, edited by S. Loeb, Springhouse Press). Convert each of the following x intervals to z intervals:
(a) 4.5 (b) x (c) 4.0 Convert each of the following z intervals to x intervals:
(d) z (e) 1.28 (f) ˆ’2.25 (g) If a female had an RBC count of 5.9 or higher, would that be considered unusually high? Explain using z values and Figure 7-12.

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