part B, C,d, and e please

Given the following task time estimates (HOURS), Task a mb Predecessor A 31 40 60 00 15 20 25 c 17 25 41 A D 15 19 26 AB E 20 25 30 CD 18 24 31 E F G 11 18 22 F a. How long is the project length (round to two decimal places)? 134,83 and what is the project variance b. What tasks form the critical path? A,C,E,F G and standard deviation (round to two decimal places) (Select) How much slack in activity D? c. How much slack is there in activity C? 0 Select) d. What is the probability that the project will be completed in 137 hours? Select) e. How many hours would be required to be 85% sure of completion? 142