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

9

10

11

A

B

5

12

18

D

5

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	enter your response here		enter your response here