You have a project to schedule using PERT: Activity Min Most likely Max duration Predecessors duration A Requirements analysis 2 months 3 months 4 months None B Programming 6 months 7 months 9 months C Hardware acquisition 3 months 3 months 3 months D Train users 12 months 12 months 12 months A E Implementation 3 months 5 months 7 months B, C F Testing 1 month 1 month 2 months E Conduct a PERT analysis and identify expected completion time for each activity. Calculate the probability of completing the project in the following periods: 18 months, 17 months, 16 months, 15 months