7. What is the precedence matrix and explain in which situations you can use it (with one of your own example). (4 points) Estimated work unit time (minutes) 0.46 0.35 0.25 0.22 1.10 0.87 0.28 0.72 1.32 0.49 0.55 6.61 Work unit 00 01 02 03 04 05 06 07 08 09 10 Work unit 00 01 02 03 04 05 06 07 08 09 10 1 11 1 1 1 11 111 111 Figure 2.21 A precedence matrix used for a line balancing problem. 11 1