The mean height of males 20 years old or older is 69.1 inches with a standard deviation of 2.8 inches. The data is based on information obtained from the National Health and Examination Survey.  Kevin is 83 inches tall. What is his z-score?

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A: Grades   9 271 10 328 11 220 12 138 PIP 18     Ratio M 44 F 56