Final answer:
Researchers are using a mathematical approach to predict body fat percentage using variables such as body weight, height, and body measurements. Methods like the Body Mass Index (BMI) and the skin-fold test are commonly used.
Step-by-step explanation:
Researchers are using a mathematical approach to predict a person's body fat percentage using variables such as body weight, height, and body measurements. One common method is the Body Mass Index (BMI), which is calculated by dividing weight (in kilograms) by the square of height (in meters). Another method is the skin-fold test, where a health professional uses a caliper to measure the thickness of skin in various parts of the body and compares it to standards to assess body fatness.