ActivityTime $($in hoursImmediatePredecessorsA$6,07\mathrm{.}25\mathrm{.}0$ABCDEF$6\mathrm{.}0,4\mathrm{.}5$B$,$ C$7\mathrm{.}7$DG$4\mathrm{.}0$E$,$ Fa$)$ Draw the project network using AON. b$)$Identity the critical path. c$)$What is the expected project length?d$)$ Draw a Gantt chart for the project. $1006$time it took to complete several recent jobs. Some of her workers are very unreliable. A list of activities and their optimistic completion time, the most likely completion time, and the pessimistic completion time $($all in days$)$ for a new contract are given in the following table:ActivityTime $($days$)$ImmediatePredecessors$)$b$368$B$4$dn$2123678$B$,$ Da$)$ Determine the expected completion time and variance for eachA, Eactivity.b$)$ Determine the total project completion time and the critical path for the project.c$)$ Determine ES$,$ EF$,$ LS$,$ LF$,$ and stack for each activity.d$)$ What is the probability that McGee Carpet and Trim will finish the project in $40$ days or less?