To calculate the population density, you divide the population by the area.
The formula is:
\[ \text{Population Density} = \frac{\text{Population}}{\text{Area}} \]
Given:
- Population = 39,292,355 people
- Area = 3,855,100 square miles
Now, let's do the calculation:
\[ \text{Population Density} = \frac{39,292,355}{3,855,100} \approx 10.19 \text{ people per square mile} \]
Rounding to the nearest whole number gives approximately 10 people per square mile.
Therefore, the correct answer is:
10 people per square mile.