On a construction site, subcontractor A is responsible for completing the structural frame of a building. When this task is complete, subcontractor B then begins the task of installing electrical wiring and outlets. The following tables show estimated probabilities of completing each task in x days: Framing time (days), x: Probability, p₁(x): 10 .10 15 .20 5 .20 20 25 30 30 .30 .10 Wiring time (days), y: Probability, p₂(y): Calculate the expected completion time and variance for each task. 10 15 20 .50 .20 .10

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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On a construction site, subcontractor A is responsible for completing the structural frame of a building. When
this task is complete, subcontractor B then begins the task of installing electrical wiring and outlets. The following
tables show estimated probabilities of completing each task in x days:
Framing time (days), x:
Probability, p₁(x):
10
.10
15
.20
20 25 30
.30 .30 .10
Wiring time (days), y:
Probability, p₂(y):
Calculate the expected completion time and variance for each task.
5 10 15 20
.20
50 .20 .10
Transcribed Image Text:On a construction site, subcontractor A is responsible for completing the structural frame of a building. When this task is complete, subcontractor B then begins the task of installing electrical wiring and outlets. The following tables show estimated probabilities of completing each task in x days: Framing time (days), x: Probability, p₁(x): 10 .10 15 .20 20 25 30 .30 .30 .10 Wiring time (days), y: Probability, p₂(y): Calculate the expected completion time and variance for each task. 5 10 15 20 .20 50 .20 .10
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