1. **State the problem:** We are given a box plot with minimum value 10 and maximum value 90. We need to find the range of the data. 2. **Formula:** The range of a data set is calculated as: $$\text{Range} = \text{Maximum} - \text{Minimum}$$ 3. **Apply the formula:** $$\text{Range} = 90 - 10$$ 4. **Simplify:** $$\text{Range} = 80$$ 5. **Interpretation:** The range tells us the spread of the data from the smallest to the largest value. Here, the data spans 80 units. **Final answer:** The range of the data is $80$.