The estimated times and immediate predecessors for the activities in a project at Howard Umrah's retinal scanning company are given in the following table. Assume that the activity times are independent.

Time (weeks)

Immediate

Time (weeks)

Immediate

Activity

a

m

b

Predecessor(s)

Activity

a

m

b

Predecessor(s)

A

7

10

12

C

7

10

11

A

B

4

12

17

D

6

10

12

B

This exercise contains only parts a, b, c, d, and e.Part 2a) Based on the activity time estimates, the expected times and variance for each of the activities are (round your response to two decimal places):

Activity	Expected Time		Variance
A	9.83		. 69

Part 3

B

11.5

4.69

Part 4

C

9.66

.44

Part 5

D

9.66

1

Part 6b) The expected completion time of the critical path = _________

enter your response here in

weeks (round your response to two decimal places).

The variance of the critical path = ________ weeks.

The expected completion time of the path other than the critical path = ____________ weeks.

The variance of the path other than the critical path = ___________ weeks.

If the time to complete the activities on the critical path is normally distributed than the probability that the critical path will be finished in 21 weeks or less = __________

If the time to complete the activities on the critical path is normally distributed than the probability that the critical path will be finished in 23 weeks or less = __________

If the time to complete the activities on the non critical path is normally distributed, then the probability that the non critical path will be finished in 21 weeks or less = _____________

If the time to complete the activities on the non critical path is normally distributed, then the probability that the non critical path will be finished in 23 weeks or less = _____________