6. The figure shows rectangle ABCD in the coordinate plane with point A(0, 2.76), B(3.87, 2.76), C(3.87,0, and D(0,0). Rectangle ABCD can be used to approximate the size of the state of Colorado with x and y scales representing hundreds of miles. At the end of 2010, the population of Colorado was 5,029,196 people. Based on this information given, what was the population density at the end of 2010 in people per square mile? Enter your answer in the box.​