Use the given information, what is the expected $($mean$)$ time to complete the activity D$?$

Use the given information, what is the variance of the activity F$?$

Use the given information, what is the expected duration for path A$-$B$-$D$-$E$?$

Used the expected time of an activity to create an activity on node $($AON$)$ network diagram, what is the slack of the activity B$?$

Use the given information, what is the expected $($mean$)$ time for project completion?

use the given information, what is the provablity that path acdf cannot he complete in $250$ days