In a construction company, project completion time is considered to be normally distributed with mean completion time

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In a construction company, project completion time is considered to be normally distributed with mean completion time being 16 weeks. There is an 80% probability that a project will take between 14 to 18 weeks to reach completion. What is the variance of project completion time?
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Engineering Economy

ISBN: 978-0132554909

15th edition

Authors: William G. Sullivan, Elin M. Wicks, C. Patrick Koelling

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