A Contractor's Project Being Analyzed by PERT Has an Estimated

Multiple Choice

A contractor's project being analyzed by PERT has an estimated time for the critical path of 120 days. The sum of all activity variances is 81; the sum of variances along the critical path is 64. The probability that the project will take 130 or more days to complete is

A) 0.1057
B) 0.1335
C) 0.8512
D) 0.8943
E) 1.29