A pert project has forty-five activities of which ninteen are on a critical path. The estimated time for the critical path is 120 days. The sum of all activities variances is 64, while the sum of variances along the activities path is 36. The probability that the project will be completed between 108 and 120 is?
1. -2.0
2. .0227
3. .1058
4. .4773
5. .9773