1. **State the problem:** Find the class boundaries for the class interval 30 – 40. 2. **Recall the definition:** Class boundaries are the actual limits of the class intervals that eliminate gaps between classes. They are found by taking the midpoint between the upper limit of one class and the lower limit of the next class. 3. **Identify the class limits:** The given class interval is 30 – 40, where 30 is the lower class limit and 40 is the upper class limit. 4. **Calculate the lower class boundary:** To find the lower boundary, subtract half the unit of measurement from the lower class limit. Assuming the data is continuous and the unit is 1, half the unit is 0.5. $$\text{Lower class boundary} = 30 - 0.5 = 29.5$$ 5. **Calculate the upper class boundary:** To find the upper boundary, add half the unit of measurement to the upper class limit. $$\text{Upper class boundary} = 40 + 0.5 = 40.5$$ 6. **Final answer:** The class boundaries for the class interval 30 – 40 are **29.5 – 40.5**.