项目经理小李对一个小项目的工期进行估算时，发现开发人员的熟练程度对工期有较大的影响。如果都是经验丰富的开发人员，预计20天可以完成；如果都是新手，预计需要38天；按照公司的平均开发速度，一般26天可以完成。该项目的工期可以估算为（ ）天。
- A.26
- B.27
- C.28
- D.29
正确答案及解析
正确答案
解析
本考题考查的知识点为三点估算法。
通过考虑估算中的不确定性和风险，可以提高活动持续时间估算的准确性。这个概念起源于计划评审技术（PERT）。PERT使用3种估算值来界定活动持续时间的近似区间。
活动持续时间=（悲观+乐观+最可能时间*4）/6=（20+4*26+38）/6=27。
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