a) Determine and 2 for each activity b) Develop the network based on the calculated 's and determine the critical path c) Determine the variance for the project d) Determine the probability for project duration 50[min];49[min] a) Determine and 2 for each activity b) Develop the network based on the calculated 's and determine the critical path c) Determine the variance for the project d) Determine the probability for project duration 50[min];49[min]