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A contractor's project being analyzed by PERT has an estimated time for the critical path of 120 days. The sum of all activity variances is

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A contractor's project being analyzed by PERT has an estimated time for the critical path of 120 days. The sum of all activity variances is 81; the sum of variances along the critical path is 64. The probability that the project will take 130 or more days to complete is

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