The Farmer's American Bank of Leesburg is planning to install a new computerized accounts system. Bank management has determined the activities required to complete the project, the precedence relationships of the activities, and activity time estimates, as shown in the following table: Time Estimates (weeks) Activity Activity Description Activity Predecessor a m b a Position recruiting b System development System training a d Equipment training 5345 5 4 a 5 Manual system test b, c 1 Preliminary system changeover b, c Computer-personnel interface d, e Equipment modification d, e Equipment testing h jk System debugging and installation f.g Equipment changeover g.i 131125 1 3 8278146 17 15 10 23 1 13 9 1 2.5 7 1 1 1 2 5 28 2 2 8 11 Determine the expected project completion time and variance and determine the probability that the project will be completed in 40 weeks or less.