PERT

provides an approach for keeping planning up-to-date
provides a way for management to require that planning be done on a uniform and logical basis
permits management to foresee quickly the impact of variations from the plan
all of the above
✅ The correct answer is option D.

A PERT network has three activities on critical path with mean time 3, 8 and 6 and standard deviations 1, 2 and 2 respectively. The probability that the project will be completed in 20 days is

0.5
0.66
0.84
0.95
✅ The correct answer is option C.