1. A project consists of five activities listed below. The project network is shown for the activities. The critical path is B-C-E and the expected completion time is 8.

	Optimistic	Most Probable	Pessimistic
Activity	Time (hr)	Time (hr)	Time (hr)
A Floor sanding	3	4	5
B Paint mixing	0.5	1	1.5
C Ceiling painting	1	5.5	7
D Wall painting	1	2	9
E Floor buffing	1	2	3

FLOOR FLOOR SANDING BUFFING PAINT START CEILING FINISH PAINT MIXING PAINT WALLS