A project's critical path has seven tasks (A through G) with expected durations and standard deviations as given below. a) What is the critical path's expected length? b) What is the standard deviation of the critical path's length? Task A B C D E F G Expected duration (days) 7 9 11 10 8 6 7 Std. Dev. (days) 2 1 2 2 1 1 1