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A small software development project has four major activities.The times (weeks) are estimated and provided in the table below. What is the variance of activity

A small software development project has four major activities.The times (weeks) are estimated and provided in the table below. What is the variance of activity D?

Activity Optimistic (a) Most Likely (m) Pessimistic (b) Immediate Predecessors A B A C B D C

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