The Farmer€™s Bank of Medicine Hat 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.

Determine the earliest and latest activity times, the expected completion time and standard deviation, and the probability that the project will be completed in 40 weeks or less.

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Time Estimates (Weeks) Activity Activity Description Predecessor a m Position recruiting 17 a System development 12 15 System training 10 a d. Equipment training 5 23 a Manual system test b, c 1 1 Preliminary system b, c 1 4 13 changeover Computer-personnel d, e 3 6 9. interface 1 2.5 Equipment d, e modification i Equipment testing h f, g System debugging and 2 2 installation 5 8 11 k Equipment changeover g. i 2. 3. 4)