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Project duration in days with precedence relationship

Project duration in days with precedence relationship Project duration in days with precedence relationship is prepared as following –ActivityImmediateOptimisticMostPessimisticPredecessorsLikelyANone567BA345CA557DB,C456EB678FC345GE,D456HG,F678Prepare the network diagramCalculate the estimated time and variance for each of the activitiesBased on ES, EF, LS, and LF calculate slackWhat is project duration? Comment on the variance of critical path.What is the probability that project will complete in 24 days?