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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?

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

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