Question

what is the purpose of the body mass index?
o to measure muscle mass
o to calculate the weight and density of bone structure
o to measure the percentage of body fat
o to judge whether a person is at a healthful weight for their height

Explanation:

The body - mass index (BMI) is calculated using a person's weight and height. It is a general indicator to assess if a person's weight is appropriate for their height, helping to identify under - weight, normal - weight, overweight, and obesity ranges. It does not directly measure muscle mass, bone weight/density, or body - fat percentage.

Answer:

to judge whether a person is at a healthful weight for their height