The following estimates of activity times (in days) are available for a small project. Activity A B D E F Activity A B D E Optimistic Most Probable F 5 7 6 6 5 4 6.0 8.0 6.5 8.0 6.0 5.0 (a) Compute the expected activity completion times and the variance for each activity. (Round your answers to two decimal places.) Expected Times Pessimistic Variance 7 9 9.5 9 8 6 (b) An analyst determined that the critical path consists of activities B-D-F. Compute the expected project completion time and the variance of this path. (Round your answers to two decimal places.) expected project completion time variance of projection completion time