To determine which calculation is done to a person's weight to find their BMI (Body Mass Index), let's analyze each option step-by-step:
1. Multiply weight by 703.
- This is a known part of the formula to calculate BMI when using pounds and inches. The full formula for BMI in this system is:
[tex]\[
BMI = \left( \frac{\text{weight (lbs)}}{\text{height (in)}^2} \right) \times 703
\][/tex]
- Multiplying the weight by 703 is a valid step in the process of calculating BMI in this context.
2. Divide weight by itself.
- Dividing any number by itself results in 1. This does not help in calculating BMI, as it doesn't involve height or provide any meaningful ratio for body mass measurement.
3. Subtract weight from heart rate.
- Heart rate is typically unrelated to the direct calculation of BMI. Subtracting weight from heart rate does not provide any logical connection or meaningful value in the context of BMI calculation.
4. Add weight to body composition.
- Body composition (typically the percentage of fat, muscle, etc. in the body) and weight are different measurements. Adding these values does not align with the standardized method for calculating BMI.
Given the options:
- Multiply weight by 703 is the correct approach used in the BMI calculation formula when using pounds and inches.
Therefore, the calculation done to a person's weight to find BMI weight is Multiply weight by 703.
