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please help me Practice Question: 2 You have been given a task which may take 60 days to complete; however if the conditions are favorable

please help me
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Practice Question: 2 You have been given a task which may take 60 days to complete; however if the conditions are favorable it may be completed in 55 days. In the worst case scenario, it may take 70 days. Find the PERT estimate, standard deviation and variance for this task

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