6. (Refer to Exercises 42–44.) Because body weight is average density times body volume, BMI is average density times a quantity that has units of length. Discuss whether BMI makes sense as a measure of being overweight. Would dividing by a different power of height make for a better measure? (See Keith Devlin, “Top 10 Reasons Why the BMI Is Bogus,” NPR, July 4, 2009, http://www.npr.org/templates/story/story.php?storyId5106268439.)