Please see the attached. I need step by step instructions for parts b and c.

3. Consider the activities, durations, and predecessor relationships in the following network. Draw the network and answer the questions that follow. Activity Immediate Optimistic Most Likely Pessimistic Description Predecessor(s) (Weeks) (Weeks) (Weeks) A 4 7 10 B A 2 8 20 C A 8 12 16 D B 1 2 3 E D. C 6 8 22 F C 2 4 G F 2 2 H F 6 NOO DO N W 10 E, G, H 4 12 I w a. Please draw the network of the project. b. What is the expected time and the standard deviation of each path? c. What is the probability of completion of the project before week 42