Question: The target completion time for a project with an expected completion time of 13 weeks and project standard deviation of 1.15 is __________ with a

The target completion time for a project with an expected completion time of 13 weeks and project standard deviation of 1.15 is __________ with a 90% certainty.

Options are: 14.0, 13.5, 14.5, 16.4 all in weeks

Do I use z-score to answer this? And its under the Statistics/Math field.

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