Exercise 2.6 on page 34. An important aspect of a schedule is its robustness. If there is a random perturbation in a robust schedule (e.g., machine breakdown, unexpected arrival of a priority job, etc.), then the necessary changes in the schedule are minimal. There is always a desire to have a schedule that is robust. (a) Define a measure for the robustness of a schedule. (b) Motivate your definition with a numerical example.