The following estimates of activity times (in days) are available for a small project. Activity Optimistic Most Probable Pessimistic A 5 6.0 7 7 8.0 9 C 7 7.5 10.5 D 7 9.0 10 E 6 7.0 9 F 4 5.0 6 (a) Compute the expected activity completion times and the variance for each activity. (Round your answers to two decimal places. ) Activity Expected Times Variance A B C D F (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