Part 1) See the table below for an activity network

Current	Preceeding	Length (units)
Activity 1	N/A	2 units
Activity 2	Activity 1	4 units
Activity 3	Activity 1	8 units
Activity 4	Activity 1	6 units
Activity 5	Activity 2	7 units
Activity 6	Activity 4	4 units
Activity 7	Activities 3, 5, 6	5 units

Draw the network with the early/late starts/finishes and amount of slack per activity. Highlight the critical path as well.

Part 2) The activities in part 1 now have statistics associated with them. Activity 2, activity 3, and activity 7 now vary.

	Time (optimism)	Time (what will usually happen)	Time (pessimism)
Activity 2	2	4	12
Activity 3	2	8	10
Activity 7	2	5	8

What is the chance that the critical path will be completed in the expected amount of time highlighted in part 1?