​a) 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

Practical Management Science
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ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
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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
8
 
10
 
13
 
A
B
5
 
11
 
16
 
D
4
 
8
 
12
 
B
 
This exercise contains only parts​ a, b,​ c, d, and e.
Part 2
​a) 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
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