need help solving asap

Question 20 5 pts You have 2 different paths through a network. They are A-D-G Expected Length 12 deviation 1 Standard B-G Expected Length 10 deviation 1.5 Standard If you assume that A-D-G is the critical path, then the probability that the project finishes in 12 weeks is 1/2 But, given that activities times can be anywhere between the optimistic and pessimistic time, A-D-G may not actually be the critical path. Considering this fact and the info I've provided above, what is the probability that the project will finish in 12 weeks? CARRY YOUR ANSWER TO 2 DECIMAL PLACES