1. **State the problem:** We have a two-way table showing the number of students choosing plain or chocolate milk in 7th and 8th grades. We need to complete the table with relative frequencies by row for the 8th grade. 2. **Given data:** - 7th grade: Plain = 18, Chocolate = 32 - 8th grade: Plain = 28, Chocolate = 22 3. **Calculate total students per grade:** - 7th grade total = 18 + 32 = 50 - 8th grade total = 28 + 22 = 50 4. **Calculate relative frequencies for 7th grade (already given):** - Plain: $\frac{18}{50} = 0.36 = 36\%$ - Chocolate: $\frac{32}{50} = 0.64 = 64\%$ - Total: 100% (by definition) 5. **Calculate relative frequencies for 8th grade:** - Plain: $\frac{28}{50} = 0.56 = 56\%$ - Chocolate: $\frac{22}{50} = 0.44 = 44\%$ - Total: 100% (by definition) 6. **Final completed table:** | Milk | Plain | Chocolate | Total | |------------|-------|-----------|-------| | 7th grade | 36% | 64% | 100% | | 8th grade | 56% | 44% | 100% | This completes the relative frequency table by row for both grades.