You're a member of a theater group and have been asked to prepare the schedule, etc. for a play scheduled for Christmas Eve service at one of the local churches in your hometown.

Activity	Predecessor	Time (days)
		Optimistic	Most Likely	Pessimistic
1	None	2	4	6
2	None	5	5	5
3	2	3	5	7
4	1	7	10	13
5	1	11	12	13
6	2,4	5	6	7
7	3	9	10	11
8	3,6	5	7	9
9	4	7	9	11
10	5	3	3	3
11	7	15	17	19
12	8	6	8	10
13	9,10	7	8	15
14	7	12	14	16
15	12,13	16	17	18