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

A PERT network has three activities on critical path with mean time 3,

1.	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
A.	0.50
B.	0.66
C.	0.84
D.	0.95
Answer» D. 0.95