# Convert x interval to z interval help

**Question description**

Let x = red blood cell count in millions per cubic millimeter of whole blood. Suppose for healthy females, x has an approximately normal distribution with mean of u = 4.3 and standard deviation of omega = 0.8. Convert the following x interval from a laboratory test to a z interval.

1.1 > x

choices include

-4 > z

-4 < z

4 < z

2 < z

1 < z

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