Consider the following work breakdown structure: Duration Estimates (Days) Activity Precedes Optimistic Most Likely Pessimistic Start U, V U W 35 50 65 V W,X 28 40 52 W Z 26 35 44 X Y 28 40 52 Y Z 26 29 38 Z End 36 60 84 What is the estimated slack time for activity W? Consider the following work breakdown structure: Start Finish Time Estimates (wks) Activity Node Node to tm tp ABCDE 1 2 11 20 29 2 3 2 5 8 2 4 18 30 42 3 4 7 10 13 1 4 31 40 43 What is the estimated expected (mean) time for activity E