A project manager of the construction project in the Cal Poly Electronics considers three different time estimates shown below:

Index	Immediate Predecessors	Optimistic (In month)	Most Likely (In month)	Pessimistic (In month)
A	-	4	7	10
B	-	4	6	14
C	-	6	7	8
D	A, B	7	15	17
E	B, C	4	5	6

(a) Calculate the expected time and the variance for each activity. Fill in the blanks. For expected activity time for each activity, carry an integer value. For activity variance, carry two decimal places.

Index	Expected time	Variance
A
B
C
D
E

(b) Calculate ES/EF/LS/LF/slack values for each activity. Use Expected activity times that you calculate in part (a) for this question.

Activity	Early Start	Early Finish	Late Start	Late Finish	Slack
A
B
C
D
E

(c) Based on the calculation of estimated times, what is the critical path? Fill in the blanks.

path 1: --> and

path 2: -->

(d) Based on the calculation of estimated times, what is the project variance? Carry two decimal places.

Project Variance =