b, What is the probability that activity F alone will take between 44 and 46 days?

The following project has three independent paths as shown in the project network diagram. The deadline to complete this project is 46 days. Most A Activity Optimistic Time (days) Likely Time (days) Pessimistic Expected Variance Time Time of (days) (days) Activity 11-2 D Start End A 10 16 28 B 20 28 42 -10 1-3 E F 18 30 42 D 15 15 15 E 1 2 3 F 42 45 48 a) What is the probability that this project will be delayed