1. The problem is to find the total number of nonfiction books sold and the relative frequency of each category. 2. The total number of books sold is the sum of all frequencies: $$14 + 11 + 7 + 10 + 8 = 50$$ 3. The relative frequency for each category is calculated by dividing the category frequency by the total sales. 4. For Biography: $$\frac{14}{50} = 0.28$$ 5. For Cooking: $$\frac{11}{50} = 0.22$$ 6. For Travel: $$\frac{7}{50} = 0.14$$ 7. For History: $$\frac{10}{50} = 0.20$$ 8. For Science: $$\frac{8}{50} = 0.16$$ 9. These relative frequencies represent the proportion of total sales for each category.