The heights of all the newborns in a certain country are normally distributed, with a mean of 19 inches and a standard deviation of 0.5 inches. A mother just delivered a baby that is 18 inches long. Which of the following represents the z-score of the baby's height? (Round your answer to two decimal places.)
A.-2.00
B.-1.50
C. 2.00
D. 1.50
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