Question: In a project network, the project completion time has been determined to be a random variable with a mean of 68 days and a standard

In a project network, the project completion time has been determined to be a random variable with a mean of 68 days and a standard deviation of 9 days (and can be assumed to be Normally distributed). How many days should we allow for this project to have approximately 90% probability of completion? (Provide one decimal place)

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