The estimated times and immediate predecessors for the activities in a project at Howard Umrahs retinal scanning company are given in the tollowing table. Assume that the activity times are independent.ActivityABa$95$Time $($weeks$)$m$1012$ImmediatePredecessors$)$b$1217$ActivityCDa$85$Time $($weeks$)$m$1010$b$1211$ImmediatePredecessors$)$ABThis exercise contains only parts a$,$ b$,$ c$,$ d$,$ and e$.$a$)$ Based on the activity time estimates, the expected times and variance for each of the activities are $($round your response to two decimal places$)$: