完成某信息系统集成项目中的一个最基本的工作单元A所需的时间，乐观的估计需8天，悲观的估计需38天，最可能的估计需20天，按照PERT方法进行估算，项目的工期应该为（ ）。
- A.20
- B.21
- C.22
- D.23
正确答案及解析
正确答案
B
解析
期望工期=（8+4?20+38）/6=21
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