Question: 2. Write the following queries in relational algebra, using the university schema. (Appendix A. page 1271) (16 points, 4 points each) c. For each department,

2. Write the following queries in relational algebra, using the university schema. (Appendix A. page 1271) (16 points, 4 points each) c. For each department, find the average salary of instructors in that department. You may assume that every department has at least one instructor. d. Find the lowest, across all departments, of the per-department average salary computed by the preceding query

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