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# IT IS OFTEN SUGGESTED THAT PROJECT MANAGERS OBTAIN THREE

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Author: Christine Farr
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http://theperfecthomework.com/it-is-often-suggested-that-project-managers-obtain-three-time-estimates-for-work-units-that-have-significant-uncertainty-associated-with-their-time-estimates/

It is often suggested that project managers obtain three time estimates for work units that have significant uncertainty associated with their time estimates. Assume you have collected three time estimates for each activity for a performance monitoring system at an international airport baggage handling system. Your cost estimate worksheet suggests the following:
Project estimate: 50 hours
Project standard deviation: 18 hours
Based on this information and assuming 3 standard deviations from the mean to include approximately 99.75% of the area under the normal distribution curve, calculate:
A. project highest credible hours
B. project lowest credible hours upper confidence limit
C. project lowest credible hours lower confidence limit
D. Explain to the airport executives, your primary sponsors, what these numbers mean.

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