Given the following task time estimates (HOURS), Taskla mb Predecessor 31 4060 B 15 20 25 17 25 41 A c D 15 19 26 A, B E 20 25 30 C, D F 18 24 31 E G 11 1822 F a. How long is the project length (round to two decimal places)? [ Select] b. What tasks form the critical path? [Select ] , and what is the project variance and standard deviation (round to two decimal places) [Select ] c. How much slack is there in activity C? 6 hours How much slack in activity D? [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