A project being analyzed by PERT has 55 activities, 8 of which are on the critical path. If the estimated time along the critical path is 125 days with a project standard deviation of 15 days, find the project deadline that gives this project a 77% chance of on-time completion.
a. from 136.04 to 136.16 days
b. from 136.52 to 136.64 days
c. from 136.4 to 136.52 days
d. from 136.16 to 136.28 days
e. from 136.28 to 136.4 days