a construction task has been estimated to take an average of 25 days with a standard deveation of 4 days. What duration should be used if there is a 90% confidence that the duration will not be exceeded? What is the probability that the duration will actually exceed 3 days? Please show formulas used and indicate answers

Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter13: Evaluating Transportation Alternatives
Section: Chapter Questions
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a construction task has been estimated to take an average of 25 days with a standard deveation of 4 days. What duration should be used if there is a 90% confidence that the duration will not be exceeded? What is the probability that the duration will actually exceed 3 days?

Please show formulas used and indicate answers 

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