A person's Body-Mass Index (BMI) is calculated by dividing weight (in kilograms) by height2 (in meters). According to the book, The Changing Body, the BMI values of non-Hispanic adult males in the United States are approximately Normally distributed with mean (μ) = 26.5 and standard deviation (σ) = 4.0. Find the standardized scores associated with the thresholds between different categories.
a. Underweight vs. Normal (BMI = 18.5) z =
b. Normal vs. Overweight (BMI = 25) z =
c. Overweight vs. Obese (BMI = 30) z =