A small new software development project at company SRT Enterprise has five major activities. The times are estimated and provided in the table below. Find the expected time for completing SRT new project?

Activity Immediate Predecessor a $($days$)$ m $($days$)$ b $($days$)$

A $-258$

B $-369$

C A $4710$

D B $2514$

E C $333$

a$)$ What is the expected completion time for this project?

b$)$ What variance value would be used in finding possibilities of finishing by a certain time?

c$)$ What is a probability if the project time exceed $2$ days after completion time?