Chapter 2, Problem 11SE

Arm spans (Example 3) According to the ancient Roman architect Vitruvius, a person’s arm span (the distance from fingertip to fingertip with the arms stretched wide) is approximately equal to his or her height. For example, people 5 feet tall tend to have an arm span of 5 feet. Explain, then, why the distribution of arm span for a class containing roughly equal numbers of men and women might be bimodal.