Activity / Immediate Predecessor / Optimistic / Most Likely / Pessimistic / Standard Deviation / Variance
A / -- / 4 / 5 / 6 / 0.333 / 0.111
B / -- / 12 / 16 / 18 / 1.000 / 1.000
C / A / 2 / 8 / 14 / 2.000 / 4.000
D / A / 5 / 5 / 5 / 0.000 / 0.000
E / B,C / 6 / 7 / 8 / 0.333 / 0.111
There are five activities in a PERT project. If the normal distribution were used to find the probability of finishing this project in 24 weeks or fewer, what mean and variance would be used?