Consider a project with A, D, G, and I are on the critical path. The variance and expected duration of each activity is given below:

Critical Path	Expected Duration	Variance
A	4	4
D	6	6
G	4	4
I	2	2

What is the probability of the project taking less than 21 days to complete? Hint: use the standard normal distribution table on page 64 of Service Project Management. (Four decimal points. For example, your answer may be 0.6534. Do not put anything other than numbers.)