1. **Stating the problem:** We are given two sets of data points (X and Y) with some missing values represented by dots. We need to analyze the data by filling in the missing values with 90 and then organize the data into a table for better understanding. 2. **Filling missing values:** According to the instruction, replace all missing values (dots) in both X and Y with 90. 3. **Organizing data into a table:** | Index | X | Y | |-------|----|----| | 1 | 80 | 78 | | 2 | 65 | 70 | | 3 | 90 | 88 | | 4 | 70 | 68 | | 5 | 85 | 80 | | 6 | 60 | 65 | | 7 | 75 | 90 | | 8 | 90 | 92 | | 9 | 50 | 55 | | 10 | 55 | 60 | | 11 | 68 | 66 | | 12 | 88 | 85 | | 13 | 77 | 74 | | 14 | 90 | 90 | | 15 | 73 | 70 | 4. **Explanation:** We replaced all missing values with 90 as instructed. This allows us to have a complete dataset for further analysis such as calculating correlation, mean, or plotting. 5. **Summary:** The completed table now contains all values with no missing data, making it ready for any statistical or algebraic operations. Final answer: The completed table with missing values replaced by 90 is shown above.