25
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
- A0.50
- B0.66
- C0.84
- D0.95
Correct answer: C
Discussion 1
Log in or create a free account to reply and vote.
0
CCommunity
0.84
Standard deviation = square root of (variance) = square root of (1 * 1 + 2 * 2 + 2 * 2) = square root of (9) = 3.
D = 20.
S = 3 + 8 + 6 = 17.
Probability = (D - S)/standard deviation = 1.
Now, from Z table probability = 0.84.
Standard deviation = square root of (variance) = square root of (1 * 1 + 2 * 2 + 2 * 2) = square root of (9) = 3.
D = 20.
S = 3 + 8 + 6 = 17.
Probability = (D - S)/standard deviation = 1.
Now, from Z table probability = 0.84.