Thanks to Rita Mulchahey's PMP Exam Prep 7th Edition I now understand the formula process for solving the activity standard deviation range of estimate for the activity. However, when I worked the problem for the overal project duration I calculate that standard deviation for the problem on page 192 in her book is 16.667 but the answer key in the book for project standard deviation is 10.060. More than likely I am wrong but I do not understand why. I would appreciate anyone's help in setting me straight.
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