题目内容
（请给出正确答案）
[主观题]
12Standard deviation of project completion is _____ . A.a relationship of the uncertainty
12 Standard deviation of project completion is _____ .
A. a relationship of the uncertainty of critical path activities.
B. an indicator of project end date target confidence
C. a function of critical path, leveling and project costs.
D. A and B
E. All of the above
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，样本方差S2。
